This is a not very user friendly script to do regular incrimental backups with btrfs send it's meant to work along side https://github.com/jf647/btrfs-snap
To use it you need to have a user on the remote machine that has sudo access to the btrfs command with no password. Then do a full btrfs send of your first snapshot. Then you can have a cron.daily script that does something like:
!/bin/sh
/opt/btrfs-snap/btrfs-snap -r /home 1d 7
/opt/btrfs-remote/btrfs-remote /home ' \.snapshot/1d' backup@192.168.1.99 /var/backup/srcmachine 7
The arguments are src prefix ssh destination destination subvolume and number of snapshots to keep. This might change in the future to be more friendly as prefix is actually a combination of the source directory and prefix from btrfs-snap.
Note that because of a bug in btrfs send this currently only works with the btrfs root mounted somewhere and a clearly marked HACK in the script. I intend to fix this when btrfs-tools is fixed.