How to migrate it onto other server?

[ally9335]

Is migrating onto a different server the same as upgrading? https://www.xmox.nl/faq/#hdr-how-do-i-upgrade-my-mox-installation

Backup a) config and b) data directory

and then, on a different server, restore the data?

[mjl-]

Yes indeed.

Don't forget to update your DNS records with the IPs of the new machine (e.g. SPF, MX, MTA-STS), and take DNS TTL (time to live) into account. You may want to reduce the TTL before migrating.

[ally9335]

Thx