I haven't bothered backing up my purchase history... I still have a lot of my installers packed away, and I backup my whole content directory on a regular basis anyway. I have backed up the wishlist, though, in case that doesn't survive.
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"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor
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"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor