Written by Jennifer Walsh. Reviewed for technical accuracy by Shubham Dixit, Independent Expert in Email Forensics and Data File Conversion.
Shubham is an independent external reviewer and not an employee of PCDOTS.
Quick answer. The free, built-in way to back up Outlook emails is to export them to a PST file, a single portable copy of your mailbox you can store anywhere. In classic Outlook, use File, Open and Export, Import/Export, Export to a file, Outlook Data File. For scheduled or live-account backups, backup software does it automatically.
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What a backup actually is here?
Backing up Outlook mail really means making a copy you own, separate from the live account, that you keep somewhere safe. It helps to know where your mail sits now. If your account is Exchange, Microsoft 365 or IMAP, Outlook keeps a cached mirror on your PC in an .ost file, but that file is tied to the account and is not a backup you can just copy and reuse. The format you actually want is a .pst, Outlook’s portable data file. So a backup is really an export to PST, one tidy file holding your emails, folders and attachments that opens on any Outlook and travels to any drive or cloud folder you like.
A backup is an exported .pst copy you own and keep away from the live account.
“For a single machine the built-in export to PST is genuinely all most people need, it makes a clean, self-contained copy of the mailbox. The mistake I see is treating the export as the whole job. A backup that lives on the same disk as the original protects you from very little, so put the .pst on a second drive or in a cloud folder, and open it once to confirm it actually reads. And decide how often, because email you backed up a year ago is a year out of date. That last part, doing it on a schedule, is where dedicated backup software earns its place.” Shubham Dixit, Email Backup reviewer (draft, pending approval)
The free way, export to a PST
This is the method for most people, and it costs nothing. In classic Outlook, go to File, then Open and Export, then Import/Export. Choose Export to a file and click Next, pick Outlook Data File (.pst), and select the account or the specific folder you want, ticking include subfolders to catch everything. Choose where to save, and you can set a password if you like. Outlook writes a single .pst holding your mail, folders and attachments.
If you are on the new Outlook for Windows, the layout differs. A PST export arrived during 2025 under Settings, then Files, then Export, though it is slower and a little more limited. If you do not see it, flip the New Outlook toggle at the top right to switch to classic Outlook, or use Help then Go to classic Outlook, and run the wizard above.
The built-in wizard, four steps to a .pst backup of your mailbox.
More free options
The export is the main one, but a few other free moves suit different needs. If your account is a POP account stored in a .pst already, you can simply copy that .pst file, find its path under File, Account Settings, Data Files, close Outlook, and copy it somewhere safe. Note that an .ost cannot be reused on its own, so for those accounts you export to .pst instead. For just a handful of messages, select them and drag them to a Windows folder, which saves each as a .msg file you can open later. And to keep old mail trimmed and archived over time, Outlook’s AutoArchive moves aging items into a separate archive .pst on a schedule you set.
Can Outlook back up automatically?
Partly, and it is worth being clear about this. The manual Export to a file wizard is a one-time job, you run it when you remember, so on its own it is not automatic. But AutoArchive in classic Outlook does run on a schedule, quietly moving older items into an archive file, which is a form of ongoing local backup. And the new Outlook is rolling out scheduled PST export too. For a true, regular, hands-off backup of everything, though, the simplest answer is backup software that runs on a timer, which is the next section.
Scheduled and live-account backups
Two situations make a dedicated tool worth it. First, if you want backups to happen automatically on a schedule without remembering to run a wizard. Second, if your mail lives in a webmail or Microsoft 365 or Gmail account and you want to pull it down to a local file, which Outlook’s export does not schedule. The PCDOTS Email Backup tool connects to live accounts and saves them to PST, EML, PDF or MBOX on a timer, without needing Outlook installed, and the PCDOTS PST Converter exports existing Outlook data to those same formats. Both run on Windows with a free trial for the first ten items. For a one-off copy, the free export above is plenty, these earn their keep when you want it regular or hands-off.
The tool route, an automatic backup to the format you choose.
Here are the tool steps with the screens.
Step 1. Install and run the software on Windows, then connect your Outlook account.
Step 2. Review the loaded mail and select what to back up.
Step 3. Open Export and choose a format, PST, PDF, EML or MBOX.
Step 4. Pick a destination and save.
Related reading, our guide to export Outlook to MBOX. To confirm a backup opened correctly, the free PST viewer opens a .pst without Outlook.
Keep the backup safe
A backup only helps if it survives whatever hits the original, so a few habits matter. Store the .pst on a different drive from your mailbox, or in a cloud folder, rather than right beside the live data. Open it once to confirm it actually reads, an untested backup is only a hope. And repeat it on some rhythm that matches how much new mail you would hate to lose, since a copy from last year is a year out of date. Small steps, but they are the difference between a real backup and a false sense of one.
Frequently asked questions
What is the free way to back up Outlook emails?
Export them to a PST file. In classic Outlook, use File, Open and Export, Import/Export, Export to a file, then Outlook Data File, and save the .pst somewhere safe.
Can I just copy my .ost file as a backup?
No. An .ost is a cached mirror tied to the account and cannot be reused on its own. Export to a .pst instead, which is portable and opens on any Outlook.
Does Outlook back up automatically?
The manual export does not, but AutoArchive runs on a schedule in classic Outlook, and backup software can back everything up automatically on a timer.
The new Outlook has no export option, what now?
A PST export rolled out in 2025 under Settings, Files, Export, but if it is missing, switch to classic Outlook with the toggle at the top right and use the Import/Export wizard.
How do I back up a Gmail or Microsoft 365 account?
Add it to Outlook and export to PST, or use backup software that connects to the live account and saves it to PST, EML or PDF on a schedule.
Where should I store the backup?
On a different drive from your live mailbox, or in a cloud folder, and open it once to confirm it reads before you rely on it.
Do it before you need it
There is not much to overthink here, and every reason not to put it off. Open Outlook, run File, Open and Export, Import/Export, and save a .pst of your mail to a drive or cloud folder away from the original, that is a real backup and it costs nothing. If you would rather it happened on its own, set up backup software to run on a schedule. Either way, the copy you make today is the one that saves you the day something goes wrong, so make it now, while everything is fine.
