Masterkey.cryptomator Synchronization

Should I also synchronize masterkey.cryptomator? I mean would that leak my AES key?

See: Why is the masterkey stored in the cloud?

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So the Masterkey is encrypted using masterkey.cryptomator using RFC-3394?

Basically, masterkey.cryptomator contains the encrypted (or wrapped to be more specific and yes using key wrapping specified in RFC 3394) encryption/MAC masterkeys. More info on how that works here: