What determines disk image expiration
I just installed a new master server that has 40TB of disk space. I noticed that after the fulls ran this past weekend the previous fulls performed were removed. What determines what is left on disk? I assumed that the high/low watermark did, but it seems that once a new full is performed it expires the previous full. Is that how it works, or is there something that can be changed to retain the backups to disk longer?