TrueCrypt is the free open-source disk encryption software for Windows Vista/XP, Mac OS X, and LinuxMain Features:    * Creates a virtual encrypted disk within a file and mounts it as a real disk.    * Encrypts an entire partition or storage device such as USB flash drive or hard drive.    * Encrypts a partition or drive where Windows is installed (pre-boot authentication).    * Encryption is automatic, real-time (on-the-fly) and transparent.    * Provides two levels of plausible deniability, in case an adversary forces you to reveal the password:      1) Hidden volume (steganography – more information may be found here).      2) No TrueCrypt volume can be identified (volumes cannot be distinguished from random data).    * Encryption algorithms: AES-256, Serpent, and Twofish. Mode of operation: XTS.

This document describes how to set up TrueCrypt 5.1a on Debian Etch (GNOME). Taken from the TrueCrypt page: "TrueCrypt is a software system for establishing and maintaining an on-the-fly-encrypted volume (data storage device). On-the-fly encryption means that data are automatically encrypted or decrypted right before they are loaded or saved, without any user intervention. No data stored on an encrypted volume can be read (decrypted) without using the correct password/keyfile(s) or correct encryption keys. Entire file system is encrypted (e.g., file names, folder names, contents of every file, free space, meta data, etc)."

When you rent a dedicated server nowadays, almost all providers give you FTP backup space for your server on one of the provider's backup systems. This tutorial shows how you can use duplicity and ftplicity to create encrypted (so that nobody with access to the backup server can read sensitive data in your backups) backups on the provider's remote backup server over FTP. ftplicity is a duplicity wrapper script (provided by the German computer magazine c't) that allows us to use duplicity without interaction (i.e., you do not have to type in any passwords).