I've got automatic backups on my iMac, and for the past week, I've gotten messages that it can't back up to my external G Drive. There's definitely room on the external drive, but I deleted a bunch of earlier backups anyway. I ran disk first aid and got the message below. Is this fixable or maybe it's the G-Drive?
Time Machine Backup/Restore Failed Mac users, who're currently running macOS Catalina or Mojave, report that they got an issue with Time Machine. Mainly, it's about Time Machine backup failed to back up the scheduled files to the configured backup disks, let it be the Time Capsule drive or third-party drive. Close preferences and library and hard drive. Go to time machine in system preferences or the dock and open it with the drive for time machine backup selected, in options you should not have anything selected from your previous list. If you do, you must go back and delete the com.apple. Timemachine.plist file again.