Apparently it's not where you need to look over the oldest and manually remove that until resolved if you need to see an immediate backup at this time. I saw your thread at
http://www.vistax64.com/vista-file-m...ugh-space.html
And at
http://www.eggheadcafe.com/software/...pc-backup.aspx
Apparently someone else in the same predictament on the Vista forum found one solution when advised to use Acronis True Image and abandon the Vista tool. The product page is seen at
http://eu.acronis.com/homecomputing/products/trueimage/
That was moved to the resolved topics section there apparently. Personally I backup as I go along rather then trying to backup an entire drive all at once. It not only saves on time but when downloading anything new like an update I will have it on the usb drive here as well as on the Vista or XP drive for ready access.