Hello,

To make backup of all the Outlook data you need to export the Outlook items to a .pst file by following below mentioned steps:

1.Go To File → Options → Advanced.

2.In Export, click Export button. Import and Export Wizard will open. Note that this wizard can also be opened by File → Open → Import.

3.Select Export to a file and click Next.

4.Select Outlook Data File (.pst) and click Next.

5.Now select the account or top level folder that you need to export for exporting all outlook objects like emails, contacts, calendar, tasks, notes etc. Check that the Include Subfolders check box is selected. Click Next.

6.Click on Browse button to specify the path where you want to save your .pst file and enter a name for file. Click Ok.
Note: Previous folder and file name will be shown if you have used the export feature previously. Also if you want to make a new file and do not want to use existing one then change name of file.

7.In Options section, you need to mention what to do when exporting the items which already exists in file, in case you are exporting to an existing Outlook Data File (.pst).

8.Click on Finish button.

Regards

Jane