The reason you are getting this response (The Drive is not a Valid Location) is that you are most likely trying to create a System Image for an operating system
post Windows 7.
You will note in the Back up and Restore process Windows 7 is in brackets.
This is because this is the last Windows operating system that can be backed up in this manner.
Windows 8 and now Windows 10 cannot be backed up (System imaged) to any external hard drive.
Basically Microsoft have done away with ability to create a Systems Image of their new operating systems.
You can purchase an independent back up process from private companies. I'm advised that Acronis is as good as any. It's not cheap but if you're really concerned or running a business it might be a worthwhile investment. I don't have it as I cannot justify
the cost.
Otherwise you're left with just backing up your individual files and folders to a flash drive or external hard drive.......Probably should do this anyway.
If you hold down the windows icon on your key board and press "I" you will get "settings" pop up. In there you will find Update & Security, this is a continuous process that you can personalise......so if you accidentally delete a file/document or a file
gets corrupted you should be able to recover it there....not perfect, but it helps.
Hope I've saved you spending hours trying to find an answer to this issue.....you'll find many posts of people getting the error message "The Drive is not a Valid Location"..........Now you know why Microsoft have done away with it!.......they just did not
tell us!