Previous Version empty in File Properties dialog

First I did this:
1. In the Control Panel, select System.
2. Select System Protection.
3. In the Protection Settings section, select the D drive.
4. Click on the Configure button.
5. Enable Only restore previous version of files.
6. Set Max Usage to 50%.
7. Click on the OK button.
8. Click on the OK button.
9. Close the System dialog.

after several weeks, when I right click on a file that has been modified several times, the Previous Versions tab is empty.

Somehow my Restore point got deleted. After creating a Restore Point, it is working correctly.

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