This extends to the whole site. You don't need backup power. At all. Maybe no redundant network equipment, if you get replacements on speed dial. Likely no redundant fiber, just don't take your time to arrange a replacement if someone cuts it (use a different, pre-scheduled conduit you can rent and fill with fiber in a day or two).

If you get unexpected "bus factor", you can handle replacement combing back early from holiday.

Get creative.