How to Back Up Outlook Emails (Step by Step)

The short answer: Outlook has no automatic backup. To back up Outlook email you export a .pst file from classic desktop Outlook, use the new Outlook's export wizard, or — because both are one-time manual dumps — auto-forward your mail to an address that archives every message to your own cloud as a .eml file. Which steps you use depends on your Outlook version, so this guide covers each.

Two things to get straight first: the Archive button and AutoArchive are not a backup — they just move mail out of your inbox, still inside the same account. And Outlook.com (webmail) has no one-click "export" button, which trips people up. Here's how each version actually works.

Does Outlook back up email automatically?

No. If your account is Exchange or Microsoft 365, a copy lives on Microsoft's servers — but that's Microsoft's infrastructure, not a backup you control, and it disappears with the account if you lose access. The old "Personal Folders Backup" add-in died with Outlook 2010. So a real backup is something you have to set up yourself. The methods below do exactly that.

Method 1: Export a PST file (classic and new Outlook, Windows)

A .pst is Outlook's own export file — one container holding the mail you select.

Classic Outlook (the traditional desktop app):

1. Select File → Open & Export → Import/Export.
2. Choose Export to a file, then Next.
3. Select Outlook Data File (.pst), then Next.
4. Pick the mailbox or folder to back up, tick Include subfolders, then Next.
5. Click Browse, choose where to save the .pst, then Finish.
6. Optionally set a password.

New Outlook (the redesigned Windows app): the export lives in Settings → Files → Export → Get started, which walks you through a wizard. It's still catching up to the classic app — it exports mail, but calendar and contacts to PST aren't supported yet.

Good: official, free, and complete for one account. Bad: it's a one-time snapshot — stale the moment it finishes, and you have to remember to repeat it. The result is a single proprietary PST that only Outlook opens, is famously prone to corruption, and makes restoring one message a chore. (Curious where it lives? Classic Outlook stores active data at C:\Users\<you>\AppData\Local\Microsoft\Outlook.)

Method 2: Back up Outlook.com (webmail)

Here's the honest part most guides skip: Outlook.com has no one-click export in the browser. You have two real options:

• Add the account to desktop Outlook over IMAP, let it sync, then run the PST export from Method 1.
• Request a data download from your Microsoft account privacy settings, and Microsoft prepares an archive you can download.

Both work, but both are clunky — which is exactly why forwarding (Method 4) is the cleaner answer for webmail: it needs no desktop Outlook at all.

Method 3: Back up Outlook for Mac

Outlook for Mac uses its own format, .olm:

1. In Outlook for Mac, open File → Export (older versions: Tools → Export).
2. Choose what to export and save the .olm file somewhere safe.

You can also let Time Machine back up the Outlook profile. Note that .olm isn't readable on Windows Outlook without conversion — another reason a standard .eml archive travels better between platforms.

Method 4: Save a single email

For a one-off — a receipt, a confirmation — you don't need a full export. Drag the message out of Outlook to your desktop to save it as a .msg, or use File → Save As and choose the message format. One caveat: .msg is Outlook's own binary format, so almost nothing else opens it — our free MSG viewer reads one in the browser, and the MSG to EML converter turns a whole folder of them into portable .eml files. To keep a human-readable copy, print it to PDF (though a PDF loses the headers and attachments a real backup keeps).

Method 5: Auto-forward to your own cloud (automatic, .eml)

This is the only method that runs by itself, and the only one that answers "does Outlook back up automatically?" with a yes. You forward Outlook to an address that archives every message to storage you own as a standard .eml file — the original message with headers and attachments intact.

With InboxBucket it works like this:

1. Connect your storage — Google Drive, OneDrive, Dropbox, or S3 — and copy your private inbound address, e.g. [email protected].
2. In Outlook or Outlook.com, add that address as a forwarding rule (all mail, or filtered to what matters — receipts, contracts, specific senders).
3. Confirm the forwarding, and every matching email lands in your storage seconds after it arrives — as the original file, deduplicated so retries never double-store.

Because it forwards from the account itself, it works straight from Outlook.com webmail with no desktop Outlook required — and since OneDrive is Microsoft's own cloud, you can keep your Outlook backups in the same place, just as portable .eml files you control. See email backup to OneDrive for that setup.

Good: continuous, automatic, portable files in storage you own. Bad: it archives from now onward — for the mail already in your mailbox, run a one-time PST export (Method 1) alongside it.

Weighing this against backing up Gmail or any other mailbox? See our comparison of email backup methods.

PST vs .eml: which format should you keep?

For a backup you want to open in ten years — on whatever software exists then — .eml wins on every axis. See what a .eml file is for the full picture.

How to restore Outlook emails from a backup

• From a PST: in Outlook, File → Open & Export → Import/Export → Import from another program or file → Outlook Data File (.pst), then pick the file.
• From .eml files: open one directly in any mail client, or drag it into an Outlook folder — no import wizard needed.

Backing up Microsoft 365 or work email?

If this is a work or school mailbox, the picture is different. Microsoft 365's retention policies, litigation hold, and the Recoverable Items folder are not a point-in-time backup — under Microsoft's shared-responsibility model, protecting the data is on you, and tenant-wide backup is a separate category of admin tooling. For an individual or a small team, a forward-based backup of your own mailbox to storage you control is a clean fit; for the full picture — what Microsoft actually keeps, the Microsoft 365 Backup add-on, and your real options — see does Microsoft 365 back up your email?

FAQ

Does Outlook back up emails automatically?

No. Outlook has no built-in automatic backup. An Exchange or Microsoft 365 account keeps a server-side copy, but that is Microsoft's infrastructure, not a backup you control, and you lose it if you lose account access. AutoArchive and the Archive button only move mail within the same account — they don't create an independent copy. To have a real backup, you must export a PST or forward your mail to storage you own.

Where are my Outlook emails and the .pst file stored?

Classic Outlook keeps active data files under C:\Users\<you>\AppData\Local\Microsoft\Outlook. A .pst you export lives wherever you chose to save it. Note that a .ost file in that folder is an offline cache of a server mailbox — not a backup, and it can't be imported into another account.

What is the difference between a .pst and .ost file?

A .pst is a portable export file you create and control — you can move it, copy it, and import it elsewhere. An .ost is an offline synced cache of an Exchange or IMAP mailbox that Outlook manages automatically; it's tied to that account and isn't a backup you can restore from directly.

How do I back up Outlook.com (webmail) email?

Outlook.com has no one-click export in the browser. Either add the account to desktop Outlook over IMAP and run a PST export, or request a data download from your Microsoft account privacy settings. To back up webmail automatically without any of that, set a forwarding rule that archives every message to your own cloud as a .eml file.

Can I back up Outlook emails to OneDrive?

Yes, but not by syncing a PST — OneDrive won't reliably sync an active .pst file (it's large and stays locked while Outlook runs). The clean way is to forward your Outlook mail to an archiving address that writes each message to OneDrive as a standard .eml. See email backup to OneDrive for the setup.

How do I restore Outlook emails from a backup?

For a PST, use File → Open & Export → Import/Export → Import from another program or file → Outlook Data File (.pst). For .eml files, open one in any mail client or drag it straight into an Outlook folder — no import step required, which is one of the reasons per-message .eml is easier to live with than a single PST.

What is the best format for Outlook backups?

One .eml file per message. It's the standard RFC 822 format — headers, body, and attachments in a portable file that opens in any mail client or text editor, today or decades from now. PST works but locks your mail in a single Outlook-specific container that's awkward to search, restore from, and open without Outlook.