Microsoft Hyper V - Checkpoints | How to create Checkpoint in Hyper-V 

Microsoft Hyper V - Checkpoints | How to create Checkpoint in Hyper-V
Using checkpoints to revert virtual machines to a previous state
One of the great benefits to virtualization is the ability to easily save the state of a virtual machine. In Hyper-V this is done through the use of virtual machine checkpoints. You may want to create a virtual machine checkpoint before making software configuration changes, applying a software update, or installing new software. If a system change were to cause an issue, the virtual machine can be reverted to the state at which it was when then checkpoint was taken.
docs.microsoft.com/en-us/virt...
Everything in this video is my personal opinion and experience, and should not be considered professional advice. Always do your own research and make sure what you're doing is safe.