I only backup data I’ve generated myself, nothing that was autogenerated or downloaded from somewhere else.

This goes far beyond backing up since not a long ago I had to deal with emptying the house of a deceased person that had been locked for a while and got to the conclusion the only things worth keeping are original ones (photos, handwritten letters and so…). Anything that could have been bought somewhere else, no matter the antique it was resulted to be almost worthless, not just to me but also to pawn shops, as it seems to be easy to find the exact same thing somewhere else.

So I took that as a life learning and apply the same concept to my data :)