Hard drives may appear simple on the surface, but there are a lot of things under the hood making them run exactly the way they’re supposed to. That’s why cloning a hard drive is not just a matter of copy and paste, but instead a rather complicated process.

Thankfully, there are great free apps that let you clone a hard drive on a Mac or Windows PC with ease. All you need is your source disk, the one you want to clone, and a destination disk. Here’s how to clone a hard drive on a Mac or Windows PC.