Are you using microsoft money 2007 or earlier? If so it looks like the issue is with the application and you can only use disks smaller than 2GB to backup. See the link below for more info.
I am already using a San Disk 32GB Ultra Fit USB to back up, and previousley used HP & Kingston USB’s betwem 8GB & 32GB for backups and have not had any problems
The link you have provided doesn’t work, although I have found other references to backups on the same site