Hi, I've downloaded the program and looked at it and determined that your tasks are saved here:
C:\Users\
UserName\Documents\DesktopReminder\tasks.dr2 (in your "Documents" folder).
The program suppose to automatically make a daily backup (I can't test this right now) and save it to the same folder under the filename: tasks.dr2.backup.
year month day such as tasks.dr2.backup.20170820
More information:
http://www.desktop-reminder.com/en/support/restore_tasks_from_backup.html
You could create a Scheduled Task and maybe use a batch file to copy the tasks.dr2 file to another folder and or drive if you want, but the setup could get a little complicated.
It would be easier use some type of daily backup software that can run on a schedule and automatically backup the file for you.
I've been searching for a small backup program myself for a while now, one that uses little memory and is able to backup several files on my PC daily to a ZIP file. I've found a few programs that I might eventually use, one of them is [
Simple Data Backup 8]. The interface isn't the prettiest, but it allows you to backup files/folders to a zip or 7zip file and place the file anywhere you want on a daily schedule. I'm sure there are other similar backup programs (I also looked at [
Cobian Backup 11] but didn't like it as much).
I hope this helps.