Saving files from DavkaWriter program

I recently bought the WD My Passport and started using it. Most of my files are backed up, but not my files from my DavkaWriter (Hebrew-English) program. The extension is .dvd. How can I add these files to my backups? Thanks for your help.

Backup tool used to take backup of data stored in PC or computer memory. You should store data from DavkaWriter (Hebrew-English) program in computer’s local storage and then try to create backup.

The documents are saved on desktop. Hi