Distributed Internet Backup System

http://www.csua.berkeley.edu/~emin/source_code/dibs/

DIBS is a peer-to-peer encrypted backup network implementation 
("disk drives are cheap, backup should be cheap too"). It uses GPG 
for encryption and can operate through firewalls and even over e-mail 
if necessary. See also Duplicity <http://www.nongnu.org/duplicity/>
(submitted by Effugas) which offers "encrypted bandwidth-efficient 
backup using the rsync algorithm" but without the distributed network 
of peers.
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