It's not really important which file format you use html and epub are very similar.. you could zip up the files to save a few bytes, if that is an issue and to make handling a bit easier I zip my ebooks up for storage by type .. burning to dvd is probably the safest/cheapest for long term storage a standard dvd will hold about 4.5 gigs... personally I use a usb drive to back up all my books you can get an 8 gig drive for < $20 in the end what way you do it is more a matter of personal preference.. I have a 32 gig sd card on my sony t1 all my books are loaded on the card .. I can mount the card in my android tablet or use a usb adapter to back the card up to my pc,,,,
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