All the images I have bookmarked on multiple devices from e621, any game I’ve been even possibly hesitating on pirating, all my Steam games (I don’t trust Inwouldnhe able to get in and install them if I could even get into my account to begin with at that point), and downloading every single song I have saved on yt and Newpipe because I’d never see them again.
A whole slew of things.
Assuming I could create magic items, definitely a magic pen that allows me and only me to grant wishes that don’t have a monkey’s paw twist to them nor have genie trickery to them.