Is it possible to export the data of one service only?
YES, it is. Google TakeOut asks you to select the service, and then it lets you choose which and how many data to export.
Google TakeOut
YES, it is. Google TakeOut asks you to select the service, and then it lets you choose which and how many data to export.
NO, it does not. TakeOut creates a copy of your data without deleting them from the Google servers.