Nav.Net NG have a nice new feature. It is called Fusker Archive. If you liked an album you can move it to Archive instead of deleting it. 

You can move albums from FG dashboard to Archive by clicking "Move to Archive" item from right click menu. You can select multiple rows and move them to archive. When you move an item to archive it will keep the state of fuskering work. You can move items back to Fusker Dashboard by choosing "Move to Dashboard" command from right click menu and continue fuskering from its previous state. 

You can view previously found images by clicking "Preview Files" command. 

When you move an album to Archive FG will merge and move sub albums too. You'll see a single row for the main album and sub albums. If an archived album have sub albums F.C. column will display the file count summary of all sub albums and the main album. You can easily move an album to FG Dashboard with its sub albums.