My T61 thinkpad with 140GB disk seemed to get used iup very quickly and I couldn't work out why. Well I have finally worked it out and this info may be of use to others.

The thinkpad creates a folder called RRbackups which is hidden. Every week it automatically makes a backup of the drive in this folder !! So you can imagine how big it gets. Mine was 50GB !!

If you run the ThinkPad Rescue and Recovery program you can 1) clear out the folder (you can't do it in windows explorer) and 2) stop the damn thing from backing up any further.

Hope that helps

Its just doing a straight drive backup. Crazy really because if the drive crashes so does the backup.

An jeremydup:
I just signed up here to say thank you for posting this little information. Even if it is three years ago, maybe you ll get a notification.
I have a fairly new Lenovo T410 and just 1 week ago 170GB of my harddrive space was gone. I googled and and posted and deleted and searched for hidden folders, made some diagnostics on my harddrive. nothing. And then finally i discorved this RRbackup hidden folder, googled it and found your post. Opened Lenovo toolbox and found the magic button. All 170Gb are back.
Thanks a lot, I was just about to delete my entire hard drive.
Daniel, with thanks from germany