...
Set up a Ubuntu 22.04 server
Do a clean install of central server software version 7.2.0 on Ubuntu 22.04 (see the X-Road Central Server Installation Guide)
Restore the central server configuration from the backup
see the Central Server User Guide, section 1312.3 for details
Verify that the central server services are running and the system is functioning.
Switch over to the new server
e.g. change the new server's IP address(es) to match the old addresses and/or update DNS, firewall, NAT, or other network configuration.
...