Legally, you're at the mercy of the provider to supply these. Most third-party applications that would provide effective backup solutions could be construed as

Legally, you're at the mercy of the provider to supply these. Most third-party applications that would provide effective backup solutions could be construed as illegal under the CFAA, as long as the ToS includes boilerplate forbidding automated or proxy access (and almost all do). Even without such a ToS, courts can and have held that merely visiting a page can constitute a copyright infringement based on the momentary copy stored in RAM being unauthorized, and specific notification that the company no longer wants you contacting their servers would also cause any future access to violate the CFAA, more or less regardless of the text of the ToS. There was a company called Power Ventures. They made it easy to export your Facebook data. They never stored anything the user didn't have a copyright interest in (that is, they only stored the user's own data, like their profile pictures and status updates). Nevertheless, Facebook took them to court and shut them down. The company had trouble retaining a lawyer after the shutdown (and companies must be represented by a member of the bar -- pro se is not allowed) and ultimately, the founder was held personally liable for $3 million in damages. That's what happens if you look like even a remote threat to a major technology incumbent. We need to fix our tech access laws.