Eh. I've sold 3 different laptops after just factory resetting them. No issues with anyone hacking my data that I've seen. But then I don't have any particularly sensitive information others might be interested in. Just ebooks, saved webpages, photos of my cats, wallpaper collections and so on. No nude pictures of real people, not even porn. My financial situation has been pretty poor all my life, because I'm lazy and my needs are modest. Nothing interesting there either.
As for my library and configuration backups, I keep them in Dropbox and on a few external drives.
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