How do crypto-currencies work?

We have a Sony Bravia television connected to a Sonos Beam which in turn is linked to a couple of Sonos Ones. They have been working fine for quite a while but suddenly lost sound.

Today we have the main developer productivity killer, startups and aliens, and build time.

There is a quote “A backup is not a backup unless you have recently performed a restore from it”; I got to find this out the hard way.