In case it helps, I hereby declare the following iron law of “free” internet services:

If you’re not paying for something, you have no reason to expect it to be there tomorrow.

This is an important corollary to the law “If you’re not paying for something, you’re not a customer; you’re the product being sold”. Everyone ought to understand that any data you store on a “free” internet service isn’t yours as ownership has hitherto been understood; it’s what you’re giving to the company as disguised payment for the service it’s offering. If the company lets you access that data from one day to the next, that’s awfully nice of them; if they stop doing so, what the hell did you expect? It was “free”. Whatever made you think it was your data anyway?