There is only one file type that uses the .NBAK extension:
Neat Backup File
Backup file created by Neat 5, a digital filing system application; contains a backup of your scanned documents, including receipts and contacts; similar to the .NRBAK and .NWBAK files.
To create a NBAK file, select, click "Browse," choose the save location (Don't select the Neat Data folder location), click "Backup" to begin the process, set a backup reminder if you'd like, and click .
To restore a database using the NBAK file, select, navigate to your file, and click .
|Neat for Windows||Commercial|
Updated: November 23, 2015