On a multi-node cluster with two or more Filestore processes, Tableau Server backups will fail during estimation of disk space on the backup job as demonstrated below:
tsm maintenance backup -f TableauServer_Backup
Job id is '54', timeout is 1440 minutes.
7% - Starting the Active Repository instance, File Store, and Cluster Controller.
14% - Waiting for the Active Repository, File Store, and Cluster Controller to start.
21% - Installing backup services.
28% - Estimating required disk space failed.
35% - Stopping the Active Repository if necessary.
42% - Waiting for the Active Repository to stop if necessary.
50% - Uninstalling backup services.
Tableau Server could not verify that there is sufficient disk space for backup. If you believe there is enough space, you may skip the disk space check and force creation of a backup by using the '--override-disk-space-check' option. The backup will fail if it runs out of space.
See 'C:\ProgramData\Tableau\Tableau Server\data\tabsvc\logs\tabadmincontroller\tabadmincontroller_*.log' on Tableau Server nodes running the Administration Controller process for server log information.
Note: Using the --override-disk-space-check option will not allow the job to complete.