Duplicity is a piece of software which provides easy encryptedversionedremote backup of files requiring little of the remote server. It does this using GnuPG, tar, and rdiff. To transmit data it can use ssh/scp, local file access, rsync, ftp, and Amazon S3. This article is about algorithms for encryption and decryption. ... Revision control is an aspect of documentation control wherein changes to documents are identified by incrementing an associated number or letter code, termed the revision level, or simply revision. It has been a standard practice in the maintenance of engineering drawings for as long as the generation of such drawings... This article needs to be cleaned up to conform to a higher standard of quality. ... The GNU Privacy Guard (GnuPG or GPG) is a free software replacement for the PGP suite of cryptographic software, released under the GNU General Public License. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... In computing, Secure shell, or SSH, is both a computer program and an associated network protocol designed for logging into and executing commands on a remote computer. ... SCP can refer to: SCP (rapper), an American rapper and producer Seattle Computer Products, an American computer company Secure copy, a protocol and the associated program for transferring files securely Service Control Point, a component of the Intelligent Network architecture for managing telephony networks. ... The title of this article should be rsync. ... The abbreviation FTP can refer to: The File Transfer Protocol used on the Internet. ...