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Got you, but as far as I know you have to host the cloude on your own network. And I already have a file storage server at home, I wanna backup the photos on a geographically different place for the worst case. For example my house burns down :D

Hm, got you.
If someone else has the same "issue" he/she might open up a cloud for you in exchange for the same service. Like a shared space. You share your cloud space and he/she shares it for you.