Setup Raspberry Pi with BTRFS and ZRAM

pibtrfs.txt

flash Rasbery Pi os image to sd card.

sudo mkdir /mnt/boot
sudo mkdir /mnt/rootfs
sudo mkdir /tmp/rootfs-backup

sudo mount /dev/mmcblk0p1 /mnt/boot
sudo mount /dev/mmcblk0p2 /mnt/rootfs

sudo rsync -aAX --info=progress2 /mnt/rootfs/ /tmp/rootfs-backup/

sudo umount /mnt/rootfs

sudo apt install cloud-guest-utils -y

sudo growpart /dev/mmcblk0 2

sudo mkfs.btrfs -f /dev/mmcblk0p2

sudo mount /dev/mmcblk0p2 /mnt/rootfs

[check brtfs partition size]
sudo btrfs filesystem usage /mnt/rootfs

sudo btrfs subvolume create /mnt/rootfs/@
sudo btrfs subvolume create /mnt/rootfs/@home

sudo rsync -aAX --info=progress2 /tmp/rootfs-backup/ /mnt/rootfs/@
sudo rsync -aAX --info=progress2 /mnt/rootfs/@/home/ /mnt/rootfs/@home
sudo rm -rf /mnt/rootfs/@/home/

sudo nano /mnt/rootfs/@/etc/fstab
[Replace ext4 lines with:]
/dev/mmcblk0p2 /      btrfs defaults,subvol=@,compress=zstd 0 1
/dev/mmcblk0p2 /home  btrfs defaults,subvol=@home,compress=zstd 0 2

sudo nano /mnt/boot/cmdline.txt
[change]
rootfstype=ext4
[to]
rootfstype=btrfs rootflags=subvol=@

sudo umount /mnt/boot
sudo umount /mnt/rootfs


[zram]
sudo apt update
sudo apt install git
git clone https://github.com/foundObjects/zram-swap
cd zram-swap
sudo ./install.sh
sudo dphys-swapfile swapoff

sudo reboot

cat /proc/swaps

sudo apt install btrfs-progs timeshift
sudo timeshift --btrfs --create --verbose