hi there i have accidentally deleted my operation husky campaign. i used the restore from backup option but no campaign is showing up in game 

In the DCG folder, there should be a backup folder with your campaign files in it (assuming you didn't delete it).  It's a bit time consuming, but you should be able to copy that folder and those files (renaming the extension .bak or .bkl to match the original type - pick the most recent saved date/time).  Where you copy it to depends on what type of campaign.

 

So I recommend you move the backed up folder out of DCG then generate a new campaign that matches your old one.  Then copy the files into it and rename their extensions to match the new ones that had been generated.