 FreeBSD has several unique features related to storage . Soft updates can protect the consistency of the UFS filesystem ( widely used on the BSDs ) in the event of a system crash . Filesystem snapshots allow an image of a UFS filesystem at an instant in time to be efficiently created . Snapshots allow reliable backup of a live filesystem . GEOM is a modular framework that provides RAID ( levels 0 , 1 , 3 currently ) , full disk encryption , journaling , concatenation , caching , and access to network @-@ backed storage . GEOM allows building of complex storage solutions combining ( " chaining " ) these mechanisms . FreeBSD provides two frameworks for data encryption : GBDE and Geli . Both GBDE and Geli operate at the disk level . GBDE was written by Poul @-@ Henning Kamp and is distributed under the two @-@ clause BSD license . Geli is an alternative to GBDE that was written by Pawel Jakub Dawidek and first appeared in FreeBSD 6 @.@ 0 . 
