Back up error

Check the media server and ensure the drive where NetBackup is installed is not full.  I'm thinking you have logging enabled and turned up too high on your media server, and the backup job is failing because the media server has no space left to write the next log entry.

If the problem really is due to a shortage of space on the media server, check your logging settings in the NetBackup client and make sure they are set to their lowest setting, then delete the old log files in C:\Program Files\Veritas\NetBackup\logs\*.

Status 155 means that the disk where NBU is installed on the master server is full.

Extract from Status Code Guide:

NetBackup status code: 155

Message: disk is full
Explanation: The write to the catalog file failed because the disk that contains
the catalog database is full.
Recommended Action: Free up space on the disks where NetBackup catalogs
reside and retry the operation.