Well ... thanks for asking this and making me go look ... It looks like it
creates a VHD of your system dirive. It does not appear to be compressed, at
least from comparing the VHD file to the drive size. I show 62.9 GB free of
111 GB, with the backup VHD sized to about 40GB.
The fact it is a VHD makes me wonder if I could boot it from Virtual Server
or PC.
--
The personal opinion of
Gary G. Little
"malcp" <malcp@discussions.microsoft.com> wrote in message
news

AD589A7-6390-4482-A98B-6ABF65F57753@microsoft.com...
> Can someone tell me if complete system backup in vista ultimate takes a
> bit
> for bit copy or does it compress the data. I ask because the first backup
> I
> did seems to have taken a long time and used a lot of space on the usb
> hard
> drive. This backup was lost so I have done another but it only seems to be
> half as big as the discs I am backing up. Is this because its thinks its
> already backed some data up and like file backup is just backing up new
> data.
> If so how do you get it to do a full back up again. hope someone can help.
> ps
> deleting the backup files and trying again makes no difference. it must
> keep
> a list somewhere!.
> --
> malcp