btrfs

Installing btrfs as boot drive on Ubuntu 14.04 - James DiGioia
http://jamesdigioia.com/installing-btrfs-boot-drive-ubuntu-14-04/

btrfs - Community Help Wiki
https://help.ubuntu.com/community/btrfs#Converting_Ubuntu_12.10_ext4_root_filesystem

How to Create and Manage Btrfs Snapshots and Rollbacks on Linux (part 2) | Linux.com | The source for Linux information
https://www.linux.com/learn/how-create-and-manage-btrfs-snapshots-and-rollbacks-linux-part-2

How to Manage Btrfs Storage Pools, Subvolumes And Snapshots on Linux (part 1) | Linux.com | The source for Linux information
https://www.linux.com/learn/how-manage-btrfs-storage-pools-subvolumes-and-snapshots-linux-part-1