What's my master key?

I’ve set up Nextcloud and want to use encryption on server base. But all documentation is talking about the ‘master key’ to restore files in the future (if needed). But I did not enter any master key ever and it was not displayed to me to save it on a safe place.

Is the master key the same as the admin password you entered the first time? Or is it an other and if so, how do I get it to store it in a safe place?

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