I recently had a look at bvckup and it's incredibly promising, the installer is just around 400kbB and it's already such a powerful product. I like the delta update feature, plus all the bonuses added by the developer. I strongly recommend that anyone reading this thread give it a try !
MerleOne, glad to see you like Bvckup.
For a small program, it is amazingly efficient in terms of its features. Of course, there are more powerful/robust programs with more capabilities. And then there are even smaller apps with less features (see Mirror
Bvckup seems to hit the mark for me.
Even though there's currently no documentation (AFAIK), I found the features easy to comprehend right away. The delta and realtime sync capabilities are very nice. Lots of potential here!
I hope to see an update soon. Seems the development has slowed a bit in recent months.