There are many concerns about backing up servers (naturally), and the best responses I found for "backing up best practices" was Best practices to keep your computer(s) backed up efficiently?.
However,
Many people recommended 'rsync', but there are many rsync applications out there (like rsync-backup and duplicity, etc), and I want to know the trade-offs and recommendations for which one to use. Is there one that simply is newer and technically superior to all the rest?