Will Downgrading Windows 10 to Windows 8.1 will delete my dat?

[Windows Central Question]

I want to downgrade windows 10 to windows 8.1. I am doing this in 30 after updating to windows 10 and doing it from "Go back to Windows 8.1" option shown in Recovery option. Will it delete my whole data or it will revert to as I used windows 8.1 before and my data will be also there?

 

[gpsskimaps]

Downgrading to win 8.1 from win 10 is not officially supported by microsoft.