Craig Severson explained his backup system one time. it seems over the top until you hear, “I can take that drive over there, plug in, reboot and I’m back to five minutes ago.”
I needed a backup device that transparent like Apple Time, was more cost effective then a appliance NAS drive, give me the most storage for my money and it had to be something I could self repair. I ended up building a 10 terabyte server powered by FreeNAS for under a $1000.
the problem that caused the need for this project presented itself in a rude way. a hard drive died inside a MacBook Pro which had a backup but it wasn’t up-to-date. this was caused by the movable nature of notebook computers. you have to remember to plug things in so that other things can happen automatically. the back up drive for Time Machine won’t work otherwise. and because nobody thinks like, “hey, so I’m going to lunch I guess I will plug this in so it will do it’s thing.” we have to make sure that backups just happen.
which brings up an ugly rule: the only time you think about backups is when you need one.