As with anything to do with computers, the first thing you should always do is backup and save your work regularly.
You can also follow these steps if you with to duplicate your base for splitting it to use the base switcher in KDP Wizard.
This applies especially more so when you are about to make changes. This quick walkthrough simply duplicates your base as it currently exists and creates a backup for you to refer back to.
Are you ready? Let's do it:
Hopefully that was fairly straight forward for you. Now you know how to backup your base by creating a duplicate, you can do this regularly so your data is always safe. It's recommended if you use your KDP account daily to create a backup once a week. If you only use it a few times week, then once a month should be enough.
In this demo, it shows how to rename your base, which can be any name you like. Bear in mind the name of the base will be used by KDP Wizard so make sure it's clear what the base is for.
You can also give your base another colour and/or icon to help you see it's a different one. For example, I always make my backups grey, but you can use your own naming & colouring conventions.