is it possible for to run a non domain backup exec server to backup and restore Servers for windows 2016 domain Servers?

Dear Sir

Background:
Windows2016 domain environment
AD x 3
Email x 1
File Sr x 2

My story is that I just cleaned up from the mess created by hacker. (For the attack, all the domain servers are affected.---- Ramsomeware. 
For the attack, the hacker damaged my backup exec server, so that I could restore back-up so easily.

My idea is that during the DR situation, I can use a second Backup exec Server (non-domain) to restore the primary backup servers (if it is damaged) and may be all other server.
(non-domain backup exec is risk free from Hacker's attack because stand alone Server requires individual credential)

My question:
Is it possible for me to run a non-domain backup exec server to backup and restore domain server for windows domain environment?