Email, I'm using the POP3 and SMTP servers of the registrars of my domains. They also have IMAP and a web interface but I'm fine to look at my mail with K9 on my phone, delete the cruft and download the messages I need. You probably want IMAP and web mail.

Photos, I sync to my laptop with Syncthing and then backup as any other file. It means that I can look at all my photos only on my laptop because I don't sync between mobile devices. Occasionally I'd like to show a picture so old that's not even on the microSD card I passed along phones but nobody really care, telling the circumstances is always good enough.