BeLight Software has released Get Backup 2.4 (http://www.belightsoft.com/products/getbackup/overview.php) for Mac OS X. The upgrade adds disk cloning capability, including bootable backups.
The folks at BeLight say that Advanced Encryption Standard (AES-256) should be used as the highest level of protection, while AES-128 is a good alternative when faster encryption is required and lower security level is acceptable. Blowfish encryption is thought to be a happy medium by providing sufficient security and a quick encryption process.
The update is free for all Get Backup users. For new users the cost is US$39.95. A demo is available for download.