Am I afraid? No. The assumption is that it will eventually. The best way to mitigate the attack is to not upload that which I want to stay hidden.
One thing of note, regarding uploading to companies that have free storage or lots of storage...
Try and stay with companies that are going to be around for the long term, such as Google or Amazon. Those are companies that have very little chance of being swallowed up and parted off by another company.
Dont let your precious memories end up in a graveyard of a dead company never to be retrieved.
Do multiple backups. Both locally and cloud based. And back up often. In fact, go run a backup right now since you're thinking of it.
READ YOUR PAPERWORK BEFORE SIGNING! IF YOU HAVE QUESTIONS, ASK!