how to enable shadow copy or previous version in Windows 2012 r2?

1. Click Start , point to Administrative Tools , and then click Computer Management .
2. In the console tree, right-click Shared Folders , click All Tasks , and then click Configure Shadow Copies .
3. In Select a volume , click the volume that you want to enable Shadow Copies of Shared Folders for, and then click Enable .
4. You will see an alert that Windows will create a shadow copy now with the current settings and that the settings might not be appropriate for servers with high I/O loads. Click Yes if you want to continue or Noif you want to select a different volume or settings.
5. To make changes to the default schedule and storage area, click Settings .