Exchange and Exchange Online Mailbox Backups Take Too Long

Backups of large Exchange and Exchange Online mailboxes might take many hours or even days to complete. To resolve this, you can configure a setting that auto-commits the backup job after a specific length of time.

Symptoms

Backups of large Exchange and Exchange Online mailboxes might take hours or days to complete. Even one large mailbox can delay the backup of other, smaller, mailboxes in the same backup job.

Causes

Microsoft EWS throttles large backup jobs. The amount of throttling can vary among users based on the status of Exchange health services.

Resolution

To resolve this issue, configure a CommCell setting that causes the Total Running Time option to appear in the Server plan. Configuring the Total Running Time option forces a backup job to auto-commit after a specific length of time.

Configure the CommCell Setting

• Configure the bShowSLAScheduleOptions CommCell setting with a Value of True. For instructions about how to add a CommCell setting, in the Commvault Cloud documentation, see Adding a CommCell Setting.

Configure the Total Running Time

1. From the navigation pane, go to Manage > Plans. The Plans page appears.
2. On the Server tab, in the Plan name column, click the server plan. The server plan page appears.
3. Beside the backup frequency setting, click the Edit button . The Edit backup frequency dialog box appears.
4. Move the Advanced toggle key to the right.
5. Select Enable total running time, and then configure the longest time a backup job should run before auto-committing.
6. Click Save.
7. To monitor the status of future backup jobs, view the SLA Report.