hopefully this is just a configuration issue but here is the gist:
We have a SBS 2011 server and it was backing up to a Western Digital USB drive (drive 1) with no problem.
I disconnected the Western Digital USB Drive (drive 1) and connected a Western Digital Passport USB drive (drive 2) because it has 30% more storage so I figured it will last several more years before I get an even larger drive.
However the last two backups have failed.
I THINK I recall when I set up Drive 1 3 years ago that I needed to exclude some TrendMicro Antivirus folders but I can't remember.
Any help in getting our backups working again is appreciated.