In the future you can move data around with the server... but as the server is not yet up I will tell you a hack:
the h2 database is written in your home folder ( on windows this is C:\Users\<name>\ ). You will find 3 iotope-node.* files, this is the database. You can copy them to your other machines. Make sure IOTOPE is not running so it hasn't any locks on the database.
I'll make sure I have migration scripts as soon as the database schema changes between versions.