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I'm not quite sure I understand your question. As far as "tracking" where I purchased which book from, I get an email receipt for every online purchase I make. I just file all the ebook receipts away in a mail folder called "ebooks". If I ever want to see where I purchased something from or how much I paid, I just do a search on that mail folder.
Otherwise, I just have a directory on my computer with all my ebooks in it. That's the "backup" of the ones on my reader. If you're extra paranoid, get a small thumb drive (not like ebooks take up a lot of space) and keep a backup on there, too.
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