During an update from Windows 8 to Windows 10, your files, settings, and installed programs should be preserved. However, it's always a good idea to create a backup of your important files and documents before starting the update process, just in case.
It's worth noting that some programs may not be compatible with Windows 10, so you may need to reinstall them after the update. Additionally, depending on the method you are using to upgrade, you may want to check the settings in the update tool to ensure that your files will be preserved during the update process.