Update. It crashed before I got to the Backup Status window. I then restarted the Roon app and have pushed it to backup again to a new folder location. It made it to the Backup Status window and has now finished. I will update next as to whether or not the nightly backup succeeds, which has not been completed since 7-2 for a nightly backup. You might want to look at the disconnect between the time I ask it to backup, it loses connection to RoonServer and it is then, that it crashes. In this case, it made it past that RoonServer loss, Backup Status, and ultimately a successful backup.
Hi @Brian_Fay,
Since a few days have passed, we wanted to check in and see how things have been performing for you.
We’ll be monitoring for your reply, thank you! 
Nightly backups fail regularly along with an additional 2x/week backup. Currently the only way I can backup successfully is manual and into a separate location (same volume). If it starts to (or is in the process of) synch the library, it will crash. Most times, I am able to reboot the server on nucleusT and then restart roon, but then it has to synch the library again. Let me know what I can do to help.
Tried to manually Backup again due to it missing dailies, etc. It crashed again and asked me to Restore. I ignored and did not restore. I restarted Roon Server and opened Roon again. It eventually came back again, but needs to rescan the entire library again.