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Note that you don’t know what the hosters know, store and/or sell about you.
There is no way to be 100% sure, but:
- bitwarden and ente have open source clients that ecrypt all data locally in a way that the provider can’t restore data
- nextcloud isn’t optimal, while you can encypt data at rest, the provider might be able to spy on you
- With mail providers it is difficult, but mailbox.org has my (personal) trust by building their business model on data protection and open source