When you refer to back up, if it is a backup of documents etc. it is for an individual user or as Petey says you can choose system wide.
Ccleaner, I have the software and it is awesome. I however, am the only user of my computer. It was my understanding the for some features that would be system wide such as reg cleaning, it must be done from and adminstrator account or run as administrator. To even see restore points, you must be in an adminstrator account or run as administrator.