Make sure you keep backups of anything you upload [...] Truncating this makes it even better advice: you never have enough knowledge or control to solely trust

Make sure you keep backups of anything you upload [...] Truncating this makes it even better advice: you never have enough knowledge or control to solely trust any valuable data or content to a service provider. Technology failures, business failures, legal failures, etc., etc. All of these can strike without warning. Keep at least three copies (e.g. a master and two backups) of anything you really care about. An online provider only ever counts as one of those copies, no matter their marketing claims.