We put ‘stuff’ in the cloud all the time – and most of the time, that’s perfectly fine because there aren’t any state secrets or self-incriminating evidence contained. The convenience factor it offers typically outweighs the risks.
Having said that, it’s always worthwhile evaluating the risks – in particular when using photo backups from your phone. Two things worth considering for cloud-based services or websites (if available) are to turn on notifications and two factor authentication. Jerry Gamblin has compiled a handy list of popular services where you can enable 2fa.