Encrypted Backup Solutions

This is mostly geared towards towards Linux/BSD users:

SpiderOak:

SpiderOak's encryption is comprehensive -- even with physical access to the storage servers, SpiderOak staff cannot know even the names of your files and folders. On the server side, all that SpiderOak staff can see, are sequentially numbered containers of encrypted data.

This means that you alone have responsibility for remembering your password or 'Password Hint' (which you can create to help you remember) allowing SpiderOak to create a true 'zero-knowledge environment' – keeping your data as safe and secure as it can possibly be.

Tarsnap:

Online backups for the truly paranoid
Tarsnap is a secure online backup service for BSD, Linux, OS X, Minix, Solaris, Cygwin, and probably many other UNIX-like operating systems. The Tarsnap client code provides a flexible and powerful command-line interface which can be used directly or via shell scripts.

Jbackpack:

JBackpack is a personal backup program. It features incremental backups, network transparency and encryption. JBackpack uses rdiff-backup for all backup and restore functions, SSHFS and SMB to access remote file systems and EncFS to encrypt backup destination directories. JBackpack runs on the GNU/Linux operating system, Mac OS X (10.5 or newer) and Windows.

Duplicati:

Duplicati is a free backup client that securely stores encrypted, incremental, compressed backups on cloud storage services and remote file servers. It works with Amazon S3, Windows Live SkyDrive, Google Drive (Google Docs), Rackspace Cloud Files or WebDAV, SSH, FTP (and many more).

Duplicati has built-in AES-256 encryption and backups can be signed using GNU Privacy Guard. A built-in scheduler makes sure that backups are always up-to-date. Last but not least, Duplicati provides various options and tweaks like filters, deletion rules, transfer and bandwidth options to run backups for specific purposes.

I've used Spideroak and I'm currently using Jbackpack with Dropbox. With all of these cloud based backup offerings you need some good encryption like Truecrypt to keep everything in check. What do you use?