This is what made me a data hoarder - lost one too many important documents and now I have 12TB of files on my home PC, mirrored across 2 drives and backed up to a 3rd in a fireproof safe. Everything from last year's tax documents to high school homework assignments, it's all there. I may have a problem...

I keep all the stuff I get and somehow manage to lose all the one I need to keep.

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I operate on the assumption that if it's an important document someone will have a copy of it.