We just upgraded our backup machine and are using an external USB3 hard
drive for backups.

Last night, something went wrong, and when I got in this morning I saw
the following errors on the backup machine:

[88921.670598] usb 1-1: device not accepting address 0, error -71
[88921.670665] hub 1-0:1.0: cannot disable port 1 (err = -32)
[88921.674631] usb 1-1: Device not responding to set address.
[88921.880971] usb 1-1: Device not responding to set address.

Could this be caused by BackupPC?  When I unplugged and replugged the
USB hard drive, it started working, but I'm worried that BackupPC is
corrupting the drive somehow.

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