Under NVBU 9.2, every NVDB backup produces temporary files under netvault/tmp, that are not cleared even when backups complete successfully.
If gone unnoticed, the partition hosting netvault TMP will run out of space leading to NVBU stopping.
The tmp files are generated by Media Manager when the backup option "Check database tables before backup" is selected.
This issue has been reported as Bug 21278 which has been resolved in NVBU 10.x
To resolve this issue, upgrade to the latest NVBU version (10.0.5 being the latest at the time of this KB creation).
If upgrading is not an option consider the following 2 alternatives:
a) Restart NVBU when possible: Restarting NVBU will force the scan and cleanup of NetVault tmp
b) Create a post-script for the NVDB backup to delete the content of netvault/tmp after the backups complete.
