Spike in Data Usage

I am trying to figure out a sudden spike in data usage at home. Data history shows monthly average of 625 GB. Then, last month was 1128 and we didn't have power/service for a week due to a hurricane. Currently, one week into this month of service, already showing 35% of data has been used. No new devices, no new habits. We are at a complete loss.

Two cell phones

One desktop computer