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I archive in both epub and mobi. I leave PDFs in their original form (most are craft or cookbooks which work better in pdf form anyway). Makes it easier on my family members since I am the keeper of the elibrary and we have both epub and mobi units. I have a backup on an external drive and a duplicate on a flash drive at a sibling's home.
I have no doubt that if either of these formats become obsolete, there will be some conversion available.
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