Our electricity provider just let us now that we will be without power for like 5 hours. I know this was asked before but what is procedure to take my HA offline and back online without full sync. Or I have to bite the bullet and wait for full resync? Also while upgrading from 5.3 to 5.4 will my sto...

I have Starwind Enterpise with to servers.
I have 3tb HA target.
What would be best way to back it up for offsite backup?
(I do plan to get another server in remote location for ansync backup but this is not an option right now)