Github for code and Google Drive for documents & photos. Google photos turned out as the best solution for photo syncing, sharing, simple editing (rotation with keybind) and unlimited free storage of pretty good quality photos. Google documents turned out as the most practical editor (cloud, sharing, all the basic editing commands). I am on the unix systems most of the time and I always find something missing in Pages or LibreOffice. If word was available on all systems I would probably use it together with dropbox, not because I prefer word, but because most of files I get are in word's format and if I have to change and help with something, its best to do it in word.

I don't really have anything else to backup. What do you guys have on your systems to require complete system backup?