Identity documents should be public information, if they lack an irrefutable connection to you (e.g. photo ID unless you've got an identical twin) they're bad identity documents. But there may be accompanying information you should keep private, for example it's not unheard of for passport authorities to provide an additional document that helps them if your passport is lost or damaged, no need to let anybody else have that.

Medical records it certainly can make sense for you to keep documents that medics don't need right now but might be relevant later. If you've got them, somebody else can't lose them.

Business plans ought to be obvious. You won't get far telling everybody what your plans are, keep them to yourself.

And nudes while it seems lots of people do send them to somebody else - perhaps much better looking people than me - if you've got nude images of yourself for some other reason then it's better to keep them private than risk some outfit accidentally losing them. For example I had images of my penis from when I had surgery done on it to fix a problem, I was tracking the healing process because I was interested in how the stitches behave. No reason to put those photos in the Clown or whatever where they're one fat finger away from being available to anybody curious.