According to the documentation, you can remove backup restore clone and verification jobs and logs from SnapCenter. SnapCenter stores successful and failed job logs indefinitely unless you remove them. You might want to remove them to replenish storage.
To do that, you can use the PowerShell cmdlets
Remove-SmJobs; however, if there is a backup associated with the job you want to delete, the operation ends with the error '
Unable to remove job because a backup is associated with it'