How much back-up memory do I need?

I've got 160 Gigs on my Macbook, so how big of a back-up drive do I need. Is one Terabyte overkill?

amember wrote:
All of you are SO helpful. I love this Forum for that reason. You guys are not just smart
Not so much (in my case, anyway). It's just that we've learned, often the hard way!
I wouldn't even mind if once a week it backed up everything and got rid of its other backups, as long as it's got a current one in there.
99% of the time, that would be fine with most of us. Until we change or delete the wrong thing, use Save instead of +Save As,+ or find that a file's been corrupted. Then being able to restore a previous version from a couple of hours earlier, in a matter of a minute or two from Time Machine . . . whew, what a relief!
Or until our internal HD fails (and they all do, eventually). Then realizing all we have to do is get the disk replaced, then re-load the entire system from a TM backup; instead of installing OSX from the Leopard Install disc, then load the updates, then find and re-load all our 3rd-party apps (hope we have a record of purchase keys!), re-do the configuration, set-up email again, re-set preferences and settings, pray for the data, . . . priceless!

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