creating a windows system image

Want to create a system image in windows 10.  Plug in USB drive that I want to use and it says it needs to be formatted as NTFS.  I do that and when I select the USB drive for the system image it says "the drive is not a valid backup location."  Any ideas?  Could this be because of size?
mkramer777Asked:
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Dr. KlahnPrincipal Software EngineerCommented:
I do that and when I select the USB drive for the system image it says "the drive is not a valid backup location." .... Could this be because of size?

Possibly.  How big is the Windows system partition, and how big is the proposed USB backup drive, and is the USB drive a hard drive or is it flash memory?  After a quick Google there appeared this:

https://www.backup-utility.com/articles/the-drive-is-not-a-valid-backup-location-3889i.html

As covered, Windows refuses to backup system to USB stick due to USB storage. Then, one of the solutions is to buy a larger USB flash drive. As tested, the USB drive that has more than 64GB free space can be recognized as backup destination by Windows Backup and Restore utility. As we all know that a USB with 64GB in size does not have 64GB free space at all. Therefore, it is recommended to purchase USB drive with 128GB in size for backup.

128 GB is still quite a large drive as flash memory goes, and I'm not sure I would want to put a system backup on a flash drive that might actually need to be used later on.

Possibility:  Try the backup using a non-Microsoft program such as Macrium Reflect (the free version) which gets good compression and is not picky about its target devices.
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