"Btrfs is the next-generation Linux filesystem all cram-full of advanced features designed for maximum data protection and massive scalability such as copy-on-write, storage pools, checksums, support for 16, count 'em, 16-exabyte filesystems, journaling, online grow and shrink, and space-efficient live snapshots. If you're accustomed to using LVM and RAID to manage your data storage, Btrfs can replace these. A snapshot is a copy of a Btrfs subvolume at a particular point in time. It's many times faster than making a traditional backup, and incurs no downtime. You can make snapshots of a filesystem whenever you want, and then quickly roll back to any of them." Articles: - http://www.linux.com/learn/tutorials/767332 - http://www.linux.com/learn/tutorials/767683 Cheers, Peter -- Peter Reutemann, Dept. of Computer Science, University of Waikato, NZ http://www.cms.waikato.ac.nz/~fracpete/ Ph. +64 (7) 858-5174