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This appears to be a centralized service. It would be great if you could run your own server.

They claim that "everything is open source". So you probably can run your own server but in this case you are not connected with anyone else I think.

True, but it's never explicitly mentioned. I think that would be a good point to include in your crowdfunding pitch.

Having everything open sourced, I wonder what they do to prevent others from copying their service.

I'm Dominik from disk42. Actually we don't to anything specific to prevent others from copying our service. We just try to be the best :)

Running a cloud storage service at scale is hard. It looks like they've already got some funding to start it.

I like the open source thing. In my opinion the only way to show that the service is really secure.

Disk42 – End-To-End Encrypted Open Source Cloud Storage on Indiegogo