1. Open Computer Management.
2. In the console tree, right-click Shared Folders, click All Tasks, and click Configure Shadow Copies.
3. Click the volume where you want to enable Shadow Copies of Shared Folders, and then click Enable.
4. To make changes to the default schedule and storage area, click Settings.

Reference

How to enable: https://technet.microsoft.com/en-us/library/cc771893(v=ws.11).aspx

Best practice: https://technet.microsoft.com/en-us/library/cc753975(v=ws.11).aspx

Troubleshooting: https://technet.microsoft.com/en-us/library/cc733019(v=ws.11).aspx