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Can user export their data in reasonable format?

Not at the moment, but we will introduce Dropbox, Gdrive integration in April.

Being able to download .zip with media and JSON files as metadata would be okay for most of us, I guess.

That also worries me a little.

That worries me a lot :-)

Me too :)

Nicely done, but definitely need some export/backup feature, or self hosted version.