Moving: From Ubuntu to CentOS 7 (webmin, virtualmin, coudmin)

Hi!

How hard is this and is it a painful for me? :)

Today i my system run @ Ubuntu but i wish tochange platform and go to CentOS7

What backups i must to do and how i can make it easy?

I have 2 disks in server what are in raid.

I hava installed virtualmin fist, then cloudmin.

i have installed certificates and modifed some ftp configurations for using SSL/TLS in ftp.

is ti possible to make some backup from all configurations sand then just restore in my fresh installed centos?

Thnx!