I prefer to keep my data on my own machines. I have a freenas server and use syncthing to synchronise photos between my phone and the server, with a cron script to organise the photos into folders.
I'm also reading a book at the moment about the history of prime numbers. Both Gauss and Reimann were such perfectionists that they didn't publish (not archive) proofs they claimed to have. There is evidence they knew much more than they let on because it wasn't up to their high standards.