You have to back up one single file Phonetray.data located in C:\Users\Public\Documents\PhoneTray folder folder on Windows 10 / 8 / 7 / Vista and in Shared Documents\PhoneTray folder on Windows XP. PhoneTray Pro stores all your data in Phonetray.data file.
To restore PhoneTray data from a backup, please do the following: open PhoneTray, click the PhoneTray logo and select Shut down PhoneTray:
Click Yes if Windows asks if you want to allow PhoneTray Service to make changes.
Copy PhoneTray.data file from your backup to the C:\Users\Public\Documents\PhoneTray folder on Windows 10 / 8 / 7 / Vista or Shared Documents\PhoneTray folder on Windows XP. You should have PhoneTray.data file in that folder already. Overwrite PhoneTray.data file in that folder with the file from your backup.
Start PhoneTray again and you should see all your call history, contacts, blacklisted and whitelisted numbers.