A Tivoli Storage Manager for SharePoint environment is configured for data pruning for Full/Incremental/Differental backups but it is not happening.
Full Backup is failing with exceptions.
Diagnosing the problem
Check the SharePoint logs to make sure that Full Backups are completing without errors.
Resolving the problem
If the Tivoli Storage Manager for SharePoint is configured for data pruning after the backup completes then data pruning will only happen if the full backup finishes without any exceptions.
If you wish to run data pruning even if the full backup completes with exceptions then you need to configure the data pruning to be run before the backup.