{"id":772,"date":"2018-04-05T09:58:30","date_gmt":"2018-04-05T09:58:30","guid":{"rendered":"http:\/\/arysontechnologies.com\/blog\/?p=772"},"modified":"2026-06-30T12:25:43","modified_gmt":"2026-06-30T12:25:43","slug":"fix-outlook-error-0x80070021-pst-backup","status":"publish","type":"post","link":"https:\/\/www.arysontechnologies.com\/blog\/fix-outlook-error-0x80070021-pst-backup\/","title":{"rendered":"How to Fix Outlook Error 0x80070021 During PST File Backup"},"content":{"rendered":"<p class=\"block_sum\"><em>IT professionals and Microsoft Outlook users often copy their PST files to create backups. But sometimes they encounter the Outlook Error 0x80070021 with the message &ldquo;<strong>The process cannot access the file because another process has locked a portion of the file<\/strong>.&rdquo; This generally happens when the required PST file is in use, or Outlook is running in the background. This article explains the causes, manual solutions, and the use of the <strong><a title=\"Outlook PST Repair Tool\" href=\"https:\/\/www.arysontechnologies.com\/outlook-pst-repair.html?\" target=\"_blank\" rel=\"noopener\">Aryson Outlook PST Repair Tool<\/a><\/strong> to achieve a secure and quick conversion.<\/em><span class=\"block_btn\"><a class=\"custom-download-btn\" href=\"https:\/\/www.arysontechnologies.com\/demo-version\/aryson-outlook-recovery.exe\" rel=\"nofollow\"> Download Now<\/a>&nbsp;&nbsp;<a class=\"custom-buy-btn\" href=\"https:\/\/www.arysontechnologies.com\/outlook-recovery\/order-now.html\" rel=\"nofollow\"> Purchase Now<\/a><\/span><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_83 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-outlook-error-0x80070021-pst-backup\/#Symptoms_of_Outlook_PST_Backup_Error_0x80070021\" >Symptoms of Outlook PST Backup Error 0x80070021<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-outlook-error-0x80070021-pst-backup\/#What_Causes_Outlook_Error_0x80070021\" >What Causes Outlook Error 0x80070021?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-outlook-error-0x80070021-pst-backup\/#How_to_Fix_Error_0x80070021_When_Taking_PST_Backup\" >How to Fix Error 0x80070021 When Taking PST Backup?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-outlook-error-0x80070021-pst-backup\/#Fix_1_Close_the_Outlook_Processes_Running_in_the_Background\" >Fix 1: Close the Outlook Processes Running in the Background<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-outlook-error-0x80070021-pst-backup\/#Steps_to_Close_Outlook_Background_Processes\" >Steps to Close Outlook Background Processes<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-outlook-error-0x80070021-pst-backup\/#Fix_2_Disable_Outlook_Add-ins\" >Fix 2: Disable Outlook Add-ins<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-outlook-error-0x80070021-pst-backup\/#Steps_to_Disable_Outlook_Add-ins\" >Steps to Disable Outlook Add-ins<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-outlook-error-0x80070021-pst-backup\/#Fix_3_Disable_Windows_Search_Indexing\" >Fix 3: Disable Windows Search Indexing<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-outlook-error-0x80070021-pst-backup\/#Steps_to_Stop_Windows_Search_Indexing\" >Steps to Stop Windows Search Indexing<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-outlook-error-0x80070021-pst-backup\/#Fix_4_Advanced_Software_to_Fix_Outlook_Error_0x80070021\" >Fix 4: Advanced Software to Fix Outlook Error 0x80070021<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-outlook-error-0x80070021-pst-backup\/#Simple_Steps_to_Resolve_Outlook_PST_File_Access_Denied_Error\" >Simple Steps to Resolve Outlook PST File Access Denied Error<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-outlook-error-0x80070021-pst-backup\/#Conclusion\" >Conclusion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-outlook-error-0x80070021-pst-backup\/#FAQs\" >FAQs<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Symptoms_of_Outlook_PST_Backup_Error_0x80070021\"><\/span>Symptoms of Outlook PST Backup Error 0x80070021<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>There are a number of problems that might occur when the Outlook PST backup error 0x80070021 appears. Given below are some of the common symptoms.<\/p>\n<ul>\n<li>Users may see the <strong>error message<\/strong> when they try to copy the Outlook PST file.<\/li>\n<\/ul>\n<table border=\"2\">\n<tbody>\n<tr>\n<td>\n<p><strong>&ldquo;The process cannot access the file because another process has locked a portion of the file.&rdquo;<\/strong><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li>The Outlook PST file may <strong>fail to copy<\/strong> to another folder or storage device.<\/li>\n<li>Even after closing Outlook, the PST file may <strong>remain locked<\/strong> or <strong>inaccessible<\/strong>.<\/li>\n<li>Furthermore, users <strong>become unable<\/strong> to <strong>move PST<\/strong> files to external drives.<\/li>\n<li>The Outlook data file backup process <strong>may stop unexpectedly<\/strong>.<\/li>\n<\/ul>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"What_Causes_Outlook_Error_0x80070021\"><\/span>What Causes Outlook Error 0x80070021?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>It is important to understand the root cause of the error 0x80070021 before proceeding to the methods of migration.<\/p>\n<ol>\n<li>A PST file might <strong>get locked<\/strong> if <strong>Outlook is<\/strong> <strong>running in the background<\/strong>.<\/li>\n<li><strong>Antivirus or security software<\/strong> may scan the PST file during backup.<\/li>\n<li>Moreover, the <strong>Windows search indexing service<\/strong> may access PST for indexing emails.<\/li>\n<li><strong>Cloud synchronization<\/strong> tools like OneDrive may continuously sync the PST file.<\/li>\n<li>Furthermore, the <strong>Outlook add-ins<\/strong> may keep the PST file active.<\/li>\n<li>The file access conflicts may occur due to the <strong>PST files stored on network drives<\/strong>.<\/li>\n<\/ol>\n<p>Now, from the above causes, identify the reason you are facing the error 0x80070021 Outlook PST file. Refer to the following solutions and choose the appropriate method to fix Outlook Error 0x80070021.<\/p>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"How_to_Fix_Error_0x80070021_When_Taking_PST_Backup\"><\/span>How to Fix Error 0x80070021 When Taking PST Backup?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>In this section, we will mainly focus on the most effective solutions to resolve the Outlook PST file backup error.<\/p>\n<ul>\n<li><strong>Close Outlook Background Processes<\/strong><\/li>\n<li>Disable Outlook Add-ins<\/li>\n<li>Stop Windows Search Indexing<\/li>\n<li>Using an Advanced Software<\/li>\n<\/ul>\n<p>Read through each of these methods carefully and apply them according to the cause of the problem. If manual methods do not resolve the issue, you can use the automated solution discussed below.<\/p>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Fix_1_Close_the_Outlook_Processes_Running_in_the_Background\"><\/span>Fix 1: Close the Outlook Processes Running in the Background<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Sometimes, even if you close Outlook, it continues running in the background. As soon as any Outlook process remains active, the PST file will remain locked and cannot be copied or backed up. Therefore, it is important to close all Outlook-related processes before taking a backup.<\/p>\n<h4 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Steps_to_Close_Outlook_Background_Processes\"><\/span>Steps to Close Outlook Background Processes<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ol>\n<li>Firstly, close the <strong>Microsoft Outlook<\/strong> application on your system.<\/li>\n<li>After that, press <strong>Ctrl + Shift + Esc<\/strong> keys to open the Task Manager.<\/li>\n<li>Next, browse the <strong>OUTLOOK.EXE<\/strong> in the list of running processes.<\/li>\n<li>Now, <strong>select the required process<\/strong> &amp; click on <strong>End Task<\/strong>.<\/li>\n<li>Make sure to check for related applications like <strong>Skype <\/strong>or <strong>Lync <\/strong>and close them.<\/li>\n<li>At last, try to <strong>copy the PST file <\/strong>again to create the backup.<\/li>\n<\/ol>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Fix_2_Disable_Outlook_Add-ins\"><\/span>Fix 2: Disable Outlook Add-ins<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Even a third-party Outlook add-in may interfere with the PST file and prevent it from being copied. Once you disable any unnecessary add-ins, it will release the locked PST file, and hence, the Outlook Error 0x80070021 will be resolved.<\/p>\n<h4 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Steps_to_Disable_Outlook_Add-ins\"><\/span>Steps to Disable Outlook Add-ins<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ol>\n<li>Firstly, use the <strong>Windows + R<\/strong> shortcut key to open the Run dialog box.<\/li>\n<li>After that, type <strong>Outlook.exe \/safe<\/strong> and open Outlook in Safe Mode.<\/li>\n<li>Next, navigate to the <strong>File <\/strong>tab &gt;&gt; <strong>Options <\/strong>&gt;&gt; <strong>Add-ins.<\/strong><\/li>\n<li>Now, click on Manage <strong>COM Add-ins<\/strong> &amp; select <strong>Go<\/strong>.<\/li>\n<li><strong>Uncheck <\/strong>all unnecessary add-ins and click <strong>OK<\/strong>.<\/li>\n<li><strong>Restart Outlook normally<\/strong> and try taking the PST backup again.<\/li>\n<\/ol>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Fix_3_Disable_Windows_Search_Indexing\"><\/span>Fix 3: Disable Windows Search Indexing<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Windows search indexing<\/strong> scans Outlook data files to index emails to achieve quick search results. During this process, the PST file may <strong>become locked<\/strong>, which prevents users from copying it. This issue can be resolved once you <strong>disable the indexing temporarily<\/strong>.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Steps_to_Stop_Windows_Search_Indexing\"><\/span>Steps to Stop Windows Search Indexing<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ol>\n<li>Firstly, open the <strong>Control Panel<\/strong> on your existing system.<\/li>\n<li>After that, click on <strong>Indexing Options<\/strong>.<\/li>\n<li>Next, click <strong>Modify <\/strong>to change the indexed locations.<\/li>\n<li>Now, <strong>remove <\/strong>the Outlook PST file location from indexing.<\/li>\n<li><strong>Apply the required changes<\/strong> &amp; <strong>restart <\/strong>your system.<\/li>\n<li>At last, <strong>attempt to copy<\/strong> the PST file again.<\/li>\n<\/ol>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Fix_4_Advanced_Software_to_Fix_Outlook_Error_0x80070021\"><\/span>Fix 4: Advanced Software to Fix Outlook Error 0x80070021<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Aryson Outlook PST Repair Tool<\/strong> is one of the most reliable solutions that can repair corrupted Outlook PST files within a few clicks. It aims to recover <strong>emails, contacts, calendars, notes, and attachments<\/strong> without affecting the original formatting or structure. Moreover, IT professionals use this software to scan PST files of <strong>different levels of corruption<\/strong>. Additionally, it can scan <strong>severely corrupted, large-sized, and password-protected PST files<\/strong>, which makes it a suitable choice for both <strong>individual users and organizations<\/strong>. Furthermore, this software can be used to <strong><a title=\"Repair PST File without Scanpst\" href=\"https:\/\/www.arysontechnologies.com\/how-to\/repair-pst-files-without-scanpst\/\" target=\"_blank\" rel=\"noopener\">repair corrupted Outlook PST files without scanpst<\/a><\/strong>. Also, the software allows users to preview the selected PST files before the recovery begins.<\/p>\n<h4 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Simple_Steps_to_Resolve_Outlook_PST_File_Access_Denied_Error\"><\/span>Simple Steps to Resolve Outlook PST File Access Denied Error<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ol>\n<li>Install the <strong>Aryson Outlook Repair Tool<\/strong> on your current system.<\/li>\n<li>Then, click on <strong>Open <\/strong>to load the required Outlook PST file from your computer.<\/li>\n<li>Choose a desired recovery mode: <strong>Standard, Advanced &amp; Deep Mode<\/strong>.<\/li>\n<li>Then, choose between the <strong>Outlook 32-bit or 64-bit versions<\/strong>, &amp; click <strong>OK<\/strong>.<\/li>\n<li><strong>Select the required items<\/strong> of the PST file &amp; cross-verify them.<\/li>\n<li><strong>Choose the output format<\/strong> &amp; <strong>apply the required filters <\/strong>if needed.<\/li>\n<li>At last, <strong>provide a particular location<\/strong> for the recovered PST file.<\/li>\n<\/ol>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>In this blog, we discussed some of the possible reasons why the Outlook error 0x80070021 takes place. Along with that, we explored several manual methods to resolve the error 0x80070021 and learned the use of advanced software. If manual methods work for you, proceed with them. But in case none of them works well, opt for the automated solution, as the issue might be residing in your PST file itself. In case of any doubts, reach out to the tech support team at Aryson.<\/p>\n<h2 class=\"faq-main_heading\"><span class=\"ez-toc-section\" id=\"FAQs\"><\/span>FAQs<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1773322752841\"><strong class=\"schema-faq-question\"><strong>Q1. What is Outlook error 0x80070021?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans: <\/strong>Outlook error 0x80070021 occurs when another process locks the PST file and prevents users from copying or backing it up.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1773322775918\"><strong class=\"schema-faq-question\"><strong>Q2. Why does the PST file fail to copy during backup?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans: <\/strong>The PST file may be locked by Outlook, antivirus software, indexing services, or cloud synchronization tools.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1773322791759\"><strong class=\"schema-faq-question\"><strong>Q3. How can I unlock a PST file in Outlook?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans: <\/strong>With the help of the Aryson Outlook PST Repair Tool, you can unlock a PST file in Outlook.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1773322807998\"><strong class=\"schema-faq-question\"><strong>Q4. Can antivirus software cause PST backup errors?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans: <\/strong>Yes, antivirus scanning may temporarily lock the PST file and prevent backup operations.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1773322824566\"><strong class=\"schema-faq-question\"><strong>Q5. Can corrupted PST files be repaired?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans: <\/strong>Yes, corrupted PST files can be repaired using professional PST recovery software.<\/p> <\/div> <\/div>\n\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-left kksr-valign-bottom\"\n    data-payload='{&quot;align&quot;:&quot;left&quot;,&quot;id&quot;:&quot;772&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;bottom&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;2&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;5&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;Rate this post&quot;,&quot;legend&quot;:&quot;5\\\/5 - (2 votes)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;How to Fix Outlook Error 0x80070021 During PST File Backup&quot;,&quot;width&quot;:&quot;142.5&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 142.5px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 19.2px;\">\n            5\/5 - (2 votes)    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p>IT professionals and Microsoft Outlook users often copy their PST files to create backups. But sometimes they encounter the Outlook<a class=\"read-more ml-1 main-read-more\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-outlook-error-0x80070021-pst-backup\/\">Read More<\/a><\/p>\n","protected":false},"author":2,"featured_media":6825,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[139],"tags":[],"class_list":["post-772","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-outlook"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Fix Outlook Error 0x80070021 During PST File Backup<\/title>\n<meta name=\"description\" content=\"Fix Outlook Error 0x80070021 during PST file backup with simple methods. Learn best solutions to back up your Outlook PST data .\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-outlook-error-0x80070021-pst-backup\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Fix Outlook Error 0x80070021 During PST File Backup\" \/>\n<meta property=\"og:description\" content=\"Fix Outlook Error 0x80070021 during PST file backup with simple methods. 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How can I unlock a PST file in Outlook?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans: <\/strong>With the help of the Aryson Outlook PST Repair Tool, you can unlock a PST file in Outlook.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.arysontechnologies.com\/blog\/fix-outlook-error-0x80070021-pst-backup\/#faq-question-1773322807998","position":4,"url":"https:\/\/www.arysontechnologies.com\/blog\/fix-outlook-error-0x80070021-pst-backup\/#faq-question-1773322807998","name":"Q4. Can antivirus software cause PST backup errors?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans: <\/strong>Yes, antivirus scanning may temporarily lock the PST file and prevent backup operations.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.arysontechnologies.com\/blog\/fix-outlook-error-0x80070021-pst-backup\/#faq-question-1773322824566","position":5,"url":"https:\/\/www.arysontechnologies.com\/blog\/fix-outlook-error-0x80070021-pst-backup\/#faq-question-1773322824566","name":"Q5. Can corrupted PST files be repaired?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans: <\/strong>Yes, corrupted PST files can be repaired using professional PST recovery software.","inLanguage":"en-US"},"inLanguage":"en-US"}]}},"_links":{"self":[{"href":"https:\/\/www.arysontechnologies.com\/blog\/wp-json\/wp\/v2\/posts\/772","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.arysontechnologies.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.arysontechnologies.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.arysontechnologies.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.arysontechnologies.com\/blog\/wp-json\/wp\/v2\/comments?post=772"}],"version-history":[{"count":6,"href":"https:\/\/www.arysontechnologies.com\/blog\/wp-json\/wp\/v2\/posts\/772\/revisions"}],"predecessor-version":[{"id":5776,"href":"https:\/\/www.arysontechnologies.com\/blog\/wp-json\/wp\/v2\/posts\/772\/revisions\/5776"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.arysontechnologies.com\/blog\/wp-json\/wp\/v2\/media\/6825"}],"wp:attachment":[{"href":"https:\/\/www.arysontechnologies.com\/blog\/wp-json\/wp\/v2\/media?parent=772"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.arysontechnologies.com\/blog\/wp-json\/wp\/v2\/categories?post=772"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.arysontechnologies.com\/blog\/wp-json\/wp\/v2\/tags?post=772"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}