This is a data centre.

If you store stuff in the cloud,
this is what those photos & files
look like in real life

1 – housed in a well-ventilated building
2 – a backup power supply, to ensure continuity
3 – through the doors is your stuff

This would be considered a small-ish data centre.

A big one, probably like Facebook’s, would use the same amount of electricity as a small town.

There’s environmental controls like air conditioning (these places get very hot), and fire suppression systems.

Even if you use the cloud to back up your stuff, it’s a good idea to make your own physical back up, and to make two.