I live in a 50 year old house. All the breakers are 16A, so 220V x 16A = 3.5kW

The electric sauna does three-phase @ 400V. My energy tracker usually peaks around 9.5kW when it’s heating.

Use a modern filesystem that manages file integrity for you.

I use btrfs.

Don’t forget to scrub and checksum your drive before making backups. You don’t want to copy over rotten bits.

Same goes for the backup. And the backup’s backup.