Yes it can. Depending on what program you're using to to do the backup of course. I'd have to know if the backup is stored as an individual file (Ideal). Use the Free program"Macrium Reflect". (Type it in Google). With that program your backup is stored as one large file. You just have to remember the name of the file for each computer's backup if you have to restore. Whatever the size you'd have sufficient room for several backups on the 2G.