The following are some best practices or recommendations we strongly recommend you follow before you start any Exchange Server 2016 Mail Level backup and restore.
Example-1: There are 100 mailboxes that need to be backup, you can divide 20 mailboxes into one backup set.
|Backup Set Name||Mailbox Number|
|Backup-Set-1||No.1 – 20|
|Backup-Set-2||No.21 – 40|
|Backup-Set-3||No.41 – 60|
|Backup-Set-4||No.61 – 80|
|Backup-Set-5||No.81 – 100|
If there are new mailboxes added, you can create new backup set for the new mailboxes.
Example-2: There are 100 mailboxes that needs to be backup, you can divide mailboxes into backup sets in alphabetic order.
|Backup Set Name||Mailbox Name Start with|
|Backup-Set-1||A – E|
|Backup-Set-2||F – J|
|Backup-Set-3||K – O|
|Backup-Set-4||P – T|
|Backup-Set-5||U – Z|
If there are new mailboxes added, you can add the new mailboxes into the original backup set by the corresponding alphabetic order.