When I first setup a backup (once a day only at shutdown) all works great. But if I have to restart the PC I will cancel the process so I don't have to wait for the backup. But, what I find out some times is that future backups start to fail as it cannot find the attached drive to backup to. Seems rather odd to me. 400G external USB/Ethernet drive. Using USB connection. Don't have any issues using the drive other that the issue mentioned above. One thing I probably need to verify is this: when I see this failure I open the window to see the error. It seems that it's at stage 3 or something when this happens. So I'm wondering if it's having issues verifying data after backup. Any ideas?