What are the advantages of using btrfs snapshots over rsnapshot in a backup scenario

Currently I use rsnapshot to backup data from one encrypted ext4 drive to another. My system opens a LUKS container on each drive and runs rsnapshot according to an hourly schedule. I'm intrigued by btrfs's built in snapshot feature, and I'm curious if it can be used in place of my current setup (assuming of course I reformat the drives). Are there any obvious issues I'm failing to realize? Can my current setup be improved by using btrfs, is it faster for example?