Backups not working yet status says they are working

StephenB, when you say "Push will fail with 6.10.4 and 6.10.5, but pull will work." do you mean that push will fail in my circumstance (ie. NAS reports full even though backup drive has plenty of space), or that pushes won't work under any condition?

I've read the above over and over and I'm confused over whether I'm pushing or pulling.  I've always done it this way:

Under "source" tab, "Name:" is set to "volume: data" (there are no other options in this drop-down) and under "destination" tab, "Name:" is set to "remote: Rsync Server" and "Host:" is "localhost".  Am I pushing or pulling?

I'm confused over the comment, "Currently rsync backup on latest ReadyNAS firmware doesn't support to backup the full data volume (Backup Source: [volume:data]/)".  I have been backing up using the above configuration for years now and until the ReadyNAS reported 100% full (per above discussion), I've been under the impression that my entire NAS has been backed up.  When I ssh onto my NAS, and change directories to my attached backup drive (cd /media/USB_HDD_7) I see the "data" directory in the root folder which appears to have all my files in it (including the subdirectory "home" which has all my individual users in it with their data in their directories).  What am I missing here?

I am happy to enable "multiple file systems", but can someone explain exactly what this does (that WAS NOT already happening)?  (It isn't going to solve the problem of the reporting that backups are successful when, indeed, they are not, is it)?

Finally, I'd like to wrap around to the original issue - the fact that the system emails me every night telling me that backups are successful, when, in fact, the backups are not completing.  Above, I was told that this is a known bug in 6.10.4 and 6.10.5 and I see that 6.10.6 has since been released, but the release notes do not address this issue.  With @JohnCM_S being gone, is someone aware of this and working on it, and is there an ETA?  I've left my NAS in its current state to help with debugging but I'm starting to feel like I may be doing this in vain.  Please let me know status on the fix.