From: DeskNow Knowledge Base
http://www.desknow.com/kb/

How do I restore a contact folder from a backup?
http://www.desknow.com/kb/idx/9/135/article/
This article applies to DeskNow 3.1 and later

DeskNow by default performs a nightly backup of all contact folders. This is configured in the Administration/Backup page.

Contacts are backed up (within the configured backup folder) into the file usercontacts.tar.gz . tar.gz archives can be opened with most unarchiving programs, including WinZip in the Windows world, and obviously the tar command in Unix/Linux/Mac.

To restore all contacts for a folder

From the usercontacts.tar.gz archive, extract the file domainname/username/foldername.csv

Then login into DeskNow as the user account, open the folder (or create a new one), and select Folder/Import . Then simply upload the .csv file extracted from the backup.

Note that if some items are already in the folder, they will be duplicated. Consider emptying the folder first, or importing into a new folder.