Schedule Power Outage of Server Room

Scheduled Power Outage in server room

hey All - our building is having a scheduled power outage and i need to power off every electrical appliance in the office and server room, i am hoping to get some advice and tips on what to backup and how i should power back on and what i should power on first. would love some advice

here is what i have

DC - bare metal backup
DNS - need to figure out how to backup
DHCP - will backup if needed
AD - will backup
exchange svr 2010 hybrid environment - not sure if i need to backup, will look into it
file server - full backup
radius server -
network switch - backup running config
firewall - backup running config
wireless controller - backup running config
router - backup config
APC - power off
DIRSYNC -