Hi,
Is that possible to use the option for backup in Virtualmin 3.65GPL and restore it in new server which installed with latest Virtualmin GPL 4.04?
Regards,
Thanesh
Howdy,
While there are always complexities involved in migrating between Virtualmin versions that are that different – it should work, in theory 
You should be able to use these instructions here in order to perform a migration:
http://virtualmin.com/documentation/system/migrate
And if you’re migrating to a second server, you’d be able to do testing on it before going live, so you can verify that things are working properly for you.
-Eric