Regardless of when you verify the databases in a backup set, you can perform the verification either on the production server or on a remote verification system.
In the simplest SnapManager configuration, verification is run from your production server; however, this type of verification is CPU and disk I/O intensive, so you might want to avoid performing verification on the production server during peak usage as it can affect Exchange performance.
Performing integrity verification on a remote system minimizes the negative performance impact on Exchange system resources and the backup schedule.