Backup rotation scheme

Hello! Do you know how sometimes you draw a picture or color a pretty picture and you want to save it forever? Well, computers also have important pictures or files that people want to save forever. But sometimes, bad things can happen to the computer and the important pictures or files can be lost forever.

To make sure this doesn't happen, people make copies of the important things called backups. These copies are like extra drawings of your picture that you hide in different places in case you lose the original one.

Now, imagine you have several copies of your drawing and you want to make sure all of them stay safe. You could put all of them in one secret hiding place, but what if someone finds it? That would be bad because you would lose all the drawings at once, just like if something bad happened to the computer where all backups were stored in one place.

So, instead of keeping all the copies in one place, people keep them in different secret hiding places. This is called a backup rotation scheme. They also use different colors for each drawing so they know which is the newest one and which one they made a long time ago.

They make sure to only use one copy at a time and when they need a new backup, they make a new one and put it in the first secret place, so the oldest copy goes to the second secret place and so on. This way, all the copies are safe and they always have at least one good copy of the important things they want to keep forever.