ImageCleanup Not Running on Catalog Backups Causing Error 129

Hello,

We are having an issue with our Catalog Backups that I am hoping somebody can shed some light into.

When the disk usage of our catalog backups reach the high-water mark, it is my understanding that an ImageCleanup automatically runs that brings the disk usage back to the low-water mark.

We are using ~13GB/day for the catalog backup. The available storage is 100GB.

Our high-water mark is currently set to 90%, and the low-water mark is set to 60%. Our retention time is set to 4 days.

However, once the disk usage for our catalog passes the 90% mark, an imageCleanup is not running; therefore, once the storage is full, the backup fails with error code 129. We then have to manually remove the images at the Unix level.