selective folder backup from a btrfs volume

So I was using the `rsync` model to backup my data. To do so, I was `rsyncing` selective folders from my `$HOME` to a btrfs based sub-volume. And then I was using `btrbk` to backup that volume to an external disk which has a `btrfs` file system on it.

This is working perfect so far with the major caveat being that I have to duplicate data from `$HOME` to the sub-volume.

So, eventually, I felt that `btrfs` has matured enough that I could trust it with my data. I converted my `$HOME`'s partition into `btrfs`.

My disk layout now is:

```
rrs@priyasi:~$ df -h
Filesystem Size Used Avail Use% Mounted on
udev 3.9G 0 3.9G 0% /dev
tmpfs 791M 2.1M 789M 1% /run
/dev/mapper/sdbCrypt-ROOT 101G 74G 26G 75% /
tmpfs 3.9G 85M 3.8G 3% /dev/shm
tmpfs 5.0M 4.0K 5.0M 1% /run/lock
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/loop0 16G 11G 4.9G 68% /var/lib/machines
tmpfs 3.9G 433M 3.5G 11% /ram-tmp
/dev/sda5 80G 58G 18G 77% /media/BTRFS
/dev/sda6 922M 136M 762M 16% /boot
/dev/sda2 256M 28M 229M 11% /boot/efi
/dev/mapper/SSHDCrypt-ROOT 375G 296G 78G 80% /media/SSHD
ram-tmp:media/SSHD/tmp-disk:disk-tmp 480G 370G 107G 78% /tmp
tmpfs 791M 1.2M 790M 1% /run/user/118
tmpfs 791M 108K 791M 1% /run/user/1000
13:39 ♒♒♒ ☺ 😄
```

`/media/SSHD` holds my `$HOME` in `/media/SSHD/rrs-home/`

What would be the best backup configuration in this case?
My intent is to have snapshots of my `$HOME`, just in case. But my backups to the external btrfs drive should only have selective folders backed up.