Question: When upgrading do files and directories stay completely in tact?

[Christian Matthew]

I want to know do they stay intact or does it create like a windows.old folder with your file pushed there? i need to know this before i upgrade...

 

[Rafael Yousuf]

All your files should remain intact, however it is recommended to perform a System backup as explained here: How to make a full backup of a Windows 10 or Windows 8.1 PC | Windows Central