I’ve been using rsync for a while now for doing backups.
I currently run my main pc, and a network pc (acting as a NAS), and use rsync to backup files between each pc. Here’s an example command.
rsync -rvt -pog –delete –progress –itemize-changes –stats "/media/storage/music/" "/media/backup/music/"

-r = recursive (to include sub-folders)
-v = verbose (so it shows [...]