For IMAP accounts in Outlook, the most direct backup method is to manually export to a local .pst file. However, you need to note: Outlook does not have an automatic scheduled backup feature; if you need automation, you must use third-party tools.
Standard Backup Steps (Export as PST File)
This method is suitable for creating a local offline copy, and works for IMAP accounts as well.
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Open Outlook desktop client, click on the top left File.
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Select Open & Export > Import/Export.
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In the pop-up window, select Export to a file, click Next.
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Select Outlook Data File (.pst), click Next.
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Select the IMAP mailbox or specific folder you want to backup (for example, Inbox), click Next.
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Click Browse to choose a storage location (it's recommended to save to a non-system drive or external hard drive), enter the file name, click Finish.
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(Optional) Set a password to protect the file.
⚠️ Key Notes
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Must wait for sync to complete: Since IMAP emails are stored on the server, before exporting, be sure to confirm that Outlook has fully downloaded all emails. If emails haven't been synced to the local computer yet, the exported
.pstfile will be incomplete. -
Special handling for IMAP folders: Some IMAP accounts may have local folders marked as "This computer only" in Outlook. These folders typically cannot be exported directly through the export wizard. The correct approach is: create a new PST file, then copy these folders into it.
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Web version cannot backup: You must use the Outlook desktop client software; the web version (OWA) does not support exporting emails.
Alternative Solutions
If you find manually clicking export too cumbersome and need regular automatic backup, you can consider searching for "Outlook backup tools" or "IMAP backup software" to achieve scheduled, automated incremental backups.
