"If you shop correctly today, you can buy a terabyte of disk for under $1000. Exactly how much under $1000 again depends on the sale of the week. But putting that amount of disk space to useful work is going to require non-trivial efforts for The Rest of Us, assuming you can fill it all up. Say, for the sake of argument, you manage to fill up that terabyte of disk space without going crazy. The next problem is backing it up."
I'm not to the point of having this problem yet. While I have a lot of data on my PC, only a few GB worth are critical. Here is my backup strategy. I have a 60 GB and a 120 GB external drive hooked up to my PC. A few generations of full backups will fit on the 120 GB. I do an additional backup of critical items to the 60 GB drive (on which I leave as many generations as there is space for). I also do a periodic backup of the critical stuff to a DVD which I take to work and store in my office for an off-site backup. What is your backup strategy?