Technically, flash drives are not supported as backup devices at this time, and as such should never appear as an option. Although it worked the one time, you should not count on it working and instead opt to backup to another partition, another hard drive, a networked location, or a CD/DVD and then copy the backup off to the flash drive if desired.
I'm using Vista Home Premium on my Inspiron laptop and performed a file backup last week (successfully) using the Backup and Restore Center. The files were saved to a usb 8g flash drive(this was only a partial backup--not full sys. backup). Now that I've changed and/or added some files to those folders, I want to do a second backup but when I insert my flash drive and open the Backup and Restore Center, it prompts for a brand new disk and label for the next backup. There isn't an option to write over the old backup or add files to the existing folder (OwnerPC) that it created last week. Obviously I can't use a brand new flash drive for every backup I perform. Going to the "change settings" screen doesn't help either. It continues to ask for a new disk for the next backup. Do I have to wipe the flash drive every time I want to do a new backup? help appreciated, blu