I'm a little confused about the best way to back up my hard disk. I have an external drvie that is three times the size of my Boot disk. I'd like to have a complete back-up of the boot drive including all of the operating system files. But I'd like that to happen on a scheduled basis. The external drive quickly fills if I set up the schedule to do that, and I'm unsure what files I can delete and still recover my system As an alternative, Perhaps one COMPLETE back-up foillwed by incremental or just all files. Even then, what files can I delete and still do a restore? It looks like the software created on rather large file follwed by several smaller ones for each subsequent back-up. Help . . .