The TSM journal can be your friend or foe. Which one depends on when and how you use it. IBM have released an FAQ around the journal and below I point out a couple of important areas. It will take you no longer than 60 seconds to improve/refresh you're understanding of the journal.
60 second intro
- Journal Backup is appropriate for backing up files systems with small or moderate amounts of change activity between backup cycles.
- A traditional incremental backup of the file system must be completed while the
journal for the file system is active.
- This backup must result in the Last Backup Completion Date being updated on
the TSM server.
- Once the full incremental backup has been completed, the change journal is marked
as valid for the TSM client node and server the backup was performed with.