iDrive backup for Mac failing I got a message from my Mac IDrive app that there has been no backup for four days. The message says the most common cause is the Mac being turned off, but my Mac is always on and connected.  IDrive has been working fine for months.  

IDrive support suggested that I upgrade to version 3.5.1.5 but that's what I have, and they haven't responded further. There's no clue in the logs; it just says "Backup operation failed" at the end after listing files for backup.  I Have paid for a years service. 

Is there a way to troubleshoot this other than requesting another support ticket?
I would keep on the vendor to explain how to debug this sync failure.
If they don’t make you happy, the team that make a ARQ software has a history of resolving issues for their clients (in my circle of Mac admins and consultants).

https://www.arqbackup.com/

If you’re technical and prefer command line, I can’t recommend rsync.net highly enough either. Their price point is attractive as is the detailed logging capabilities for troubleshooting - if you can set it up, you can troubleshoot it easily. Go for arq if ease of setup is your preference.

https://rsync.net/products/attic.html