Personal cloud storage lets individuals and small teams keep files online, synchronise them across devices and share them through links or folders. People use it for documents, photos and collaboration with relatives, clients or colleagues.
Files in cloud storage tend to be the most mixed collection of personal and professional data a person owns. The key question is who can read them: with server-side encryption the provider holds the keys, while client-side or end-to-end encryption keeps content opaque to the provider, usually at the cost of server-side search, previews or recovery of forgotten passwords. Sharing links bring their own risks, because access often outlasts the intention. The provider's jurisdiction decides which authorities can demand content or metadata, and your exit depends on whether you can export everything with folder structure and versions intact, since a sync client does not necessarily give you a full copy. The EU Data Act strengthens portability between data-processing services, a useful benchmark when you judge exit options.
When choosing a European option, look for documented client-side encryption and what it covers, an open-source client or server, self-hosting, control over link expiry and passwords, and a straightforward bulk export.