Restoring Permissions in sharepoint sites

Hi all,

Some users(owners) deleted permissions in sharepoint 2010 document library. I would like to restore permissions for that document library. I am using a third party tool that do not save permissions.

people is giving permissions to folders(unique permissions) in document libraries.

What is the best tool or is there any way to back up permissions using powershell then restore permissions for a specific site, document library, list, etc?

Thank you,

Bill

nme