R is very outdated. Magrittr and Dplyr change a lot how to play with data in R. The rest is very cool.

Exactly, good documentation plus normal linux skills and you are set up ready to play with it..

Yes, you have read correctly.

I have owncloud on a old Asus eee 701 with debian + apache2+ SQL + PHP on an external HD drive of 500GB. For one user run like heaven, the hardware was my first generation netbook. Although I though to replace it with a Rasp Pi 2, there would no big advantage beside the size.

I use owncloud 8.0.X, that works ok. Great for sync works files and be on a working trip and need some old file just because you boss say, something like... do you remember that thing that you didi like 1 year ago?, could you make some slides for tomorrow? And you are traveling on a clean new computer... jump into the VPN and 5 min later, all is ok.