How to reduce disk space used by Document previews

Issue

• We have noticed that half of the backup size corresponds to Document previews from the Document Library.
• Is there a way to clean up these files and reduce the backup size?

Environment

• Liferay DXP 7.1
• Liferay DXP 7.2
• Liferay DXP 7.3

Resolution

• You can delete the preview and thumbnail files for Documents and Media by following these steps:
  
  1. Go to Control Panel → Configuration → Server Administration
  2. On the Resources tab, find to the Clean Up Actions section
  3. Execute Reset preview and thumbnail files for documents and media.

Additional Information

• What is the significance of "Reset preview and thumbnail file for Documents and Media" option?