I may decide to move from desktop to server at some point in the future. Is it easy enough to move your data file from desktop to server? What database does the server version use?
You can easily move your data from Desktop to Server. I am not sure on the type of database used but from desktop you will just take a backup (top right) and in the server you will just import.
Copied pasted from http://www.manager.io/server/faq/
Is server edition compatible with desktop edition?
Yes. We maintain 100% compatibility between the free desktop edition and the server edition. You can transfer data between the server and desktop edition with ease.