Step 5: Settings

Compression

By default, all the backup data is compressed while storing in the backup repository. If disabled the original size of the backup data will be stored.

Retention

Enabling this option lets you specify the number of restore points you want to retain. If disabled, all restore points will be retained.

• User Mailbox (Mail, Calendar & Contacts): From the drop-down list select the time to retain. You can choose either days, months or years. 
• User Mailbox (OneDrive): You can select both the number of versions and number of days to retain the OneDrive items. The minimum retention is 5.

• Group Mailbox (OneDrive): You can select both the number of versions and number of days to retain the OneDrive items. The minimum retention is 5.

• SharePoint Sites: You can select both the number of versions and number of days to retain the SharePoint Sites. The minimum retention is 5.

• Teams: You can select both the number of versions and number of days to retain the SharePoint Sites. The minimum retention is 5.