Migration nextcloud to new server - migration of collectives

Hi everyone,

i migrate an existing nextcloud installation to a new server - everything work as expected except the contents of the collective app. Because the files are encrypted the content is not readable. As it is mentioned in the administrator documentation the files will be encrypted when the server-side encryption is enabled.

How can i tranfer the content of a collective installation within the migration from one to another server?

Kind regards
derde1968