Thank you, Vincent. I'll try the expression column.
It might be strange characters, I'll check that.
I've grown to like using Linux for backup, however. I run Ubuntu off a usb stick, and I've never had a random hang or missing file. I've had hangs and missing files using Windows Copy functions when copying 25k files at a time, and I'm not sure it's worth the time to trouble shoot. Could be hardware, could be software, etc.