All information about the Xcode server bot is stored in CouchDB. Path (current for Server.app 5.2 and Xcode.app 8.2.1):
/Library/Developer/XcodeServer/Database/* /Library/Developer/XcodeServer/Database/xcs.couch
Most likely you can copy and paste the entire XcodeServer folder from one server to another and start the Xcode Server service.
A few other helpful tips when working with Xcode Server:
richardpiazza
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