If you do not need to retain up-to-the-minute restore ability from a backup that is not the most recent, you can reduce the amount of disk space required by omitting the backup of transaction logs that Exchange truncates after the SnapManager Backup operation finishes.
By default, SnapManager backs up database and the transaction logs. SnapManager creates a database Snapshot copy and a SnapInfo Snapshot copy, and truncates transaction logs by removing any entries already committed to the database.
Manage this feature using the Back up transaction logs that will be truncated by Exchange at the end of the backup option in the Advanced Options dialog box.
The option to back up all transaction logs (including those that Exchange truncates after the backup operation finishes) is selected by default. When you clear the option to back up all transaction logs, the database and transaction log verification cannot be deferred, and the option to back up all transaction logs is automatically enabled the next time you start SnapManager.