What I
wouldn't recommend is using a cloud service like Flickr if you value the integrity of your data. Recently they charged me with a "Community Guideline Warning" because I accidentally included a folder filled with non-photo images, and threatened to delete my account within three days. There is no way to appeal or know which content is specifically in violation. All they left was a curt, automated email. You can request all your data from Flickr to save everything, but they state that the process can take up to several weeks before you're given a download link, longer than the three days it takes for them to arbitrarily terminate your account.
Even with services like MEGA that tout keywords like "encryption" and "privacy" without end, look at their Terms of Service and there will be a clause stating that they will still give all your data to any law enforcement agency that puts in a request, including encrypted files. And they have no choice but to do so, because of the very same issue that's forcing the personal privacy debate with Apple into the spotlight - hosting any kind of illegal data, which is for all intents and purposes synonymous with CSAM, makes your service criminally liable in dozens of different jurisdictions. A public cloud provider that allows arbitrary file uploads and has absolute privacy cannot exist because of the necessity to allow law enforcement to investigate reports of the illegal hosting of CSAM in dozens of different countries.
Any expectation of privacy is a facade when dealing with the cloud. Even beyond the issue of privacy, you're still at the whims of the cloud provider in the end. Fail to play by their rules, and you're done for.