backup unmount script errors on mail server
Recent 3.2 backup changes cause errors about unmount scripts failing.
Some discussion/info in https://www.howtoforge.com/community/threads/backup-directory-var-backup-could-not-be-unmounted.85701/
I see this error email from our mail server node every night. The above discussion seems to be involving mail servers as well. I believe I do not see this error from our web/db server node (which uses the same mount/unmount scripts, to shared storage).