This is for Images NOT file/folder backup.
You can do one of 2 things or a combination.
Let's say you've just made an image in the root of your 1.5TB ext USB HDD.
Say it's F:
F:\WindowsImageBackup (1) Move
You can rename it and/or move it to a folder, say wstore
Windows will happily make another Image in F:\ because it does see one now. (2) Rename
Rename F:\WindowsImageBackup to say F:\WindowsImageBackup_24_11_10
Windows will happily make a new image now under F:\
When it comes time to reimage your old versions move and or rename them back to
If and F:\WindowsImageBackup already exists there then move or rename it first. You can make as many images on a single partition as you have space using these very simple procedures. Recovery using the System Repair Disk of any of these multiple copies is described in the Tutorial
NOTE: Move and rename is almost instant because it's a directory change. Don't use Copy unless you really want a copy. It will take ages.
File/folder backups will not be deleted unless you choose to. They will be added to and occasionally the old one will be kept and brand new one complete new one created.