The easiest and safest way to transfer nethserver

NethServer Version: 7.6.1810
Modules: nextcloud, onlyoffice, webtop, sogo, basically mail.
what is the best and easiest way to move nethserver between different servers of totally separate locations. like from OVH to DO.
is this below normal for only those apps installed

Maybe rsync between them, via OpenVPN.
Is backup on premises (DO/OVH) or on cloud?

check if clamd is not eating your ressources