Depends on what you mean by "backup". Backup to me (and most others that I've talked to) means "I can restore all my data, my entire hard drive, and be back to

Depends on what you mean by "backup". Backup to me (and most others that I've talked to) means "I can restore all my data, my entire hard drive, and be back to where I was yesterday, so if I screw up my kernel tonight, I can just use the backup to revert to my pre-kernel hacking spree". (to an average joe, it means the same thing, but not as much detail)