Will Upgrading to Windows 8 Delete My Files?
Contents All Your Personal Files, Applications and Settings Are Preserved When You Upgrade to Windows 8.1 Through the Store. Data That You Might Have Stored on...
All your personal files, applications and settings are preserved when you upgrade to Windows 8.1 through the store. Data that you might have stored on other partitions or drives in your system are not affected. – Make sure you apply the latest updates before upgrading.
Will upgrading from Windows 8 to 8.1 delete my files?
Nope, once you upgrade through the Store on the Start Screen, your apps, personal settings will be preserved. If this is the case, I cannot at the moment see ANY reason to change to 8.1.
Will upgrading to Windows 10 from Windows 8.1 delete my files?
If you are currently using Windows XP, Windows Vista, Windows 7 SP0 or Windows 8 (not 8.1), then Windows 10 upgrade will erase all your program and files (see Microsoft Windows 10 Specifications). … It ensures a smooth upgrade to Windows 10, keeping all your programs, settings and files intact and functional.