V11 SP8

Configuring Backup Quotas for Exchange Mailboxes

Setup Exchange Mailbox Backup Quota to check for mailboxes in a subclient that exceed the quota that is set for the subclient. Mailboxes that exceed 90 percent of the quota generate a warning email. Mailboxes that exceed the quota generate an alert email and are not backed up until some backed up messages are erased from secondary storage.

The first backup operation for a new subclient cannot enforce limits because the subclient must be backed up once to determine how much backup storage space a mailbox is actually consuming. That amount is usually less than the source data because of factors such as deduplication and compression.

Tip: If it seems that quotas are not enforced, run the backup job for that subclient a second time. After the backup job completes, confirm that the mailboxes that are over the specified quota generate notifications as expected.

If you enabled source pruning for end-user erase, then erasing backed up messages from secondary storage also removes them from primary storage (that is, the Exchange server).

Before You Begin

  • You must enable Exchange Mailbox Backup Quota.


  1. From the CommCell Console, expand Client Computers > client > agent > backup_set.
  2. Right-click a subclient, and then click Properties.

    The Properties dialog box appears.

  3. On the General tab, select the Mailbox Quotas (based on media usage) check box.
  4. In the Skip mailboxes that have exceeded n MB box, type a new media usage limit.
  5. Click OK.

    The limit is enforced the next time the subclient is backed up. If a mailbox exceeds 100 percent of its quota, the mailbox is not backed up again.

What to Do Next

If mailboxes that approach or exceed their quota prevent messages from being backed up, you can do the following:

  • Increase the quota for the subclient.
  • Enable End-User Erase so that users can remove backed up messages by browsing and erasing them. For more information, see Exchange Mailbox End-User Erase.