"Btrfs is a new copy-on-write file system for Linux that
supports a number of features lacking in other Linux file systems
such as pooling, snapshot, checksum and integral multiple device
"So, far the most popular filesystem in use for a majority of
the Linux distributions is EXT4. Using Btrfs as the default will
open up a number of new features such as better data integrity
through checksum, snapshot of the filesystem before any major
change, better volume management and RAID."