Hi guys. Iv had a few install and hosting issues in the past and so have decided to setup a second hosting with a second provider just to see how well it works having a failover server. i have centos 6.9 running ispconfig 3 on the old server i have centos 7 running ispconfig 3.1 on the new server my question is: resync. what is it? is it a tool in itself? or does it require additional tools to work? from what i have read i select the server to send the information to, im just unsure on how to add the server to which i wish to sent the data to. also i have noticed that ispconfig 3 doesnt have the option to select a server. or does this require the migration tool? do to its cost (im using this as a test scenario) i am trying to find a way to do this without it costing (more than my time) these servers are for email only. no websites. but also controls DNS name server configuration.