Maciej is easily one of my favorite writers.

And speakers! I recommend: https://www.youtube.com/watch?v=5Vt8zqhHe_c

Regarding backups... I'm paid user and I don't have any idea how I'd back up the content of the mirrored pages. I understand that the bookmarks alone can be exported.

On another side, I always hoped that I won't have to backup anything from pinboard.in.