I've been using this app for over a year. Initially I used the free version (when it was available on the Mac App Store) and later I've purchased the full version from their website. I loved the app for its simplicity and the easy way to create various backups or syncs.
While I was using the App Store version, I quickly realized that it has obvious bugs which makes the app problematic to use. Support was quick and helpful and they patched up the bugs.
But more and more bugs started to show up. Eventually I abandoned the app and started to use a different backup program which was exceptional but way too robust. And as I was saying I really liked Get Backup Pro because it was simple.
A few months later I checked back where the app was, as far as bug fixes, and noticed that release a few updates since I used the app. So I installed it again and started to use it. Which brings us to today (May of 2020), using the latest 3.5.4 (1425) version.
I am keep facing with more and more bugs to the point that it is unusable at this point. Erroneous messages and files appearing in the file list that don't even exist neither on my source nor on my target device. I have emailed support with a detailed description and screenshots of the problem. A few days later they release the current version - 3.5.4 (1425) - but the above mentioned problem still intact. So at this point I am not able to make any backups or syncs for over 2 weeks now with the app.
I can see now that this was a bad investment. The app is nice, love the simplicity, support is, I'd say, great, but the constant bugs and bugs and bugs, is not only disappointing but makes the app difficult, if not impossible, to use.
As of now, I will completely abandon this app and will resort to the other, more cumbersome app to use for backups/syncs. I don't want to mention the competition for obvious reason, but that app is rock solid despite it has such a multitude of features, most I won't ever use.
I'm quite disappointed with this app and the fact I threw out nearly 20 bucks on the window.