Adam Hardy wrote at about 22:25:31 +0100 on Thursday, October 20, 2022:
 > Looking through those logs for anything at the time of the modification
 > timestamp on the backuppc xferlog, I can see this one line which
 > appears about 25 mins after the backup fails:
 > 
 >    Oct 17 16:13:48 localhost smartd[1302]: Device: /dev/sdb [SAT], 1
 >    Currently unreadable (pending) sectors
 > 
 > The target USB drive is /dev/sdb1.
 > 
 > But as I said, I scanned the drive and it didn't log any errors. Is
 > that useful info?
 > 

As others have advised, USB drives are not very reliable for critical
storage needs like backup. It's not particularly surprising that
issues could occur with large file reads/writes like you have with
your 2TB of video.


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