However before you go exploring Windows 10 it’s time to make that final image backup. So reboot the computer, click on the “Earlier Version of Windows” icon to load Windows XP, then launch your backup software and create a backup of the entire drive.
After completing the image backup your USB drive should have 3 folders and look similar to those shown below.
How does Windows XP boot after installing Windows 10: Set Windows Explorer to show hidden files and folders. You should now see all the folders and files located in the Windows XP partition. There are three key folders and files in XP (C:\Boot, C:\bootmgr and C:\ntldr). C:\Boot contains the Boot Configuration Data (BCD store) needed to boot to either XP or Windows 10.
Note: Should you need to restore Windows XP or the Windows 10 Technical Preview you can just select the partition that you want to restore, no need to restore the entire drive.
If you are using Windows XP for most of your work and just exploring Windows 10 then you should consider creating a “Scheduled” daily backup of the Windows XP partition, or you can include both Windows XP and 10 partitions if you like and have the available space on your external USB drive. Pick a time when you know the PC will be on but you’re not using it, Dinner time for example.