I've always relied upon external storage (most recently Vimeo) ti archive my final videos. In addition, I have masters on at least two separate drives. I do keep original source footage, but only one copy, and ti be honest it's no big deal if I lose it.
But now I have a family, all the shirt clips have become precious. And I'm already clocking up some serious drive space.
So for those of us hoarder amateurs. How do you keep digital archives if the footage (not tape based!)