nipsirc and gsobier:
sorry for I creating such a passioned discussion. I only meant to present to others that there are different forms of protecting your data!
In my opinnion archiving and backuping are two different things with two different ultimate goals that is why they are implemented in different forms!
In a backup you usually keep multiple time related copies of the same data, for example you dump to a tape a file on monday, then on tuesday you dump the difference of that file to the same tape (but it is store on a different location), on wednesday you do it again and so on. So if on friday you realised you made a mistake on wednesday than you restore the initial backup of monday and the tuesday difference and you are set!
With archiving you duplicate the copy (usually without compression) and you keep only the current instance of a single file. So you can't revert backup to an older copy!
And please guys don't start comparing your guns to see which one is bigger! (I would win any way
, seriously I doubt any of you manages the amount of data I do these days! We are now at 1Penta Byte and growing around 200GB per day and soon that number should double!)
Just provide good advice to people and that is it.
For personnal backup any type of solution that actually duplicates your data to different media (and possibly also from inside the computer) is more than enough!
Charles' solution is good, Brad's solution is good, nipsirc solution is good, gsobier solution is good, my solution is acceptable(the implemented one) so if you aren't doing any of this start seriouly thinking of doing it.
But like gsobier points out, test that your backups/archives can be easily and accurately restored, there is nothing worse than a false sense of security!