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It's important to keep backups of all your documents and that includes your emails. Keeping regular backups means you have some protection in the event of data loss. Here we have a step by step guide on how to backup your mailbox to a local file when your using Outlook.

 
In Outlook, click on File then click on Open & Export followed by clicking the Import/Export button.
  



Select Export to a file

then click the Next button
  




Select Outlook Data File (.pst)

then click the Next button
   



To backup the entire mailbox, select the mailbox name. If you only want to backup certain folders, you can select those folders instead.

If you have more than one mailbox, make sure you've selected the correct one.

Ensure Include subfolders is checked

Press the Next button
  




Click Browse to choose where you want to store your backup and give it a meaningful name so you can find it later.

Click the Finish button
  




You can protect your backup with an optional password to keep prying eyes off your data. If you don't want a password, leave the password blank and just press the OK button.

That's it, Outlook will backup your mailbox to the file.