The ATM itself uses very little power. The machine has its own battery backup (Uninterruptible Power Supply) in place, so it is not necessary a battery backup unit.
Only one plug is required; this plug can be either 110V or 220V.
Please note that if you are using 220V power, the switch on the PSU needs to be switched from 110V to 220V.
Also, the UPS doesn’t run on 220V unless the ATM was originally shipped to Europe. If it has a USA style plug, the UPS doesn’t use it.