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Cannot get Windows Backup to complete successfully! Error 0x81000037
Back in 2015 I set up a USB 3.0 external HDD for backups, and used Windows Backup for awhile to make weekly backups of the system. It worked for a short while, then the backups started failing, and I never got around to fixing it. I went over a year with no real backup in place.
Now I'm trying to get the backups going again, and so far have been unsuccessful at every turn.
I have removed all previous contents from the USB drive and reformatted the drive several times today. Every time I run Windows Backup and set it up to run at 1 AM every day, it starts the backup immediately I guess to create the initial backup, and after 1-2 hours it errors out with error 0x81000037, and the message: "The backup was not successful. The error is: Windows Backup failed while trying to read from the shadow copy on one of the volumes being backed up. Please check in the event logs for any relevant errors. (0x81000037)."
I did some reading and thought the problem was caused by choosing to backup the root C: drive plus several of the subfolders on C:. I tried NOT checking the root C:, and instead only selected a few of the subfolders. That didn't work.
I tried not backup up C: at all, and instead only backing up my user profile folder and the entire D: data HDD, plus checked the option to make a system image of C:. Still no good.
Any other suggestions what to try? I had a catastrophic HDD failure in 2009 with no backup in place, and I'd rather not go through that again.