Your digital belongings can depend on a company continuing to find them profitable.

Your photographs, music, books, and documents may exist only for as long as some company finds hosting them worthwhile. That is a strange arrangement for the record of a life, and it holds regardless of how permanent the service currently seems.

Keep your own copies of what you would grieve losing. A drive, a second location, an occasional export. Do it once a year on a set date so it actually happens. Nothing about this is urgent until the day it is, and by then the option has usually gone.