The last link – the most important one in this news – finally has a proper documentation of rsnapshot_backup parameters. By the way, since it appeared in the public domain, we had to work a little on the names. Renamed to more understandable backup types, for example.
RSYNC_NATIVE after the update to v1, to say the truth, was badly broken and not tested. Now this type of backup has been repaired and tested – everything works as in the documentation.