If self-hosting it is a good idea to be comfortable with general server administration processes (those that are common across different software). If restoring with a backup, make sure both versions of Central are the same (the original one and the new one). And please fully test the new server before deleting the old one.
Note that the documentation on backups is not updated to include the end of Google Drive backups (read more in the post linked below). The post suggests 3 options for backing up:
Someone else suggests a company called VEEAM for backups.
The above link assumes you aren't changing hostnames. If you are, there process is a lot more complicated because you'll have to find and replace the hostnames in the Redis databases that Enketo uses. Email firstname.lastname@example.org for assistance with that.
Looking to save time? Try ODK Cloud, the official managed hosting service from the creators of ODK.