I'm in the "backup regularly, but probably should do it more often" category. I have a plug-in hard drive that I use to backup my PC data, and which includes my PDA backups (which I do weekly, on PC and on SD card). The PC backups I do less often. The hard drive holds more than a stack of CDs, and it plugs into my PC via USB, making transfer easy. Then I unplug the backup drive, to extend its life and to make sure a PC failure doesn't automatically take the backup with it.
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