I'm using Paragon Backup and Recovery 17 CE (basically, the free home-use version) on Windows 10. Full backups work fine. However, I've set up a differential backup and I never get any differentials, it always does a full backup. Same thing happens if I try incremental.

I saw a KB article (https://kb.paragon-software.com/article/226) that seemed to relate, but talked about scripts, which I don't know about. I just set up the backup parameters in the program and let it run. It could be a simple PATH issue, because the system is clearly not finding the base file.