human
What is the best way to make sure I don't lose any data after upgrading to Windows 10?
assistant
The best way to make sure you don't lose any data after upgrading to Windows 10 is to back up your files before you install it. You can use an external hard drive or cloud storage services like Dropbox or OneDrive to keep a copy of all of your important files. Additionally, if you have extra space on your computer's hard drive, you could consider moving some of your less-used files to that location so they won’t be affected by the upgrade.