Till now I have used Mozy and Acronis backup. Mozy is a online backup while Acronis is offline backup. Mozy does provide a good encryption but as i said its online and require you to pay for its subscription. Acronis just provides password protection to your backup but its not encryption.

I am still to test the the other two you mentioned.

For my own use, I use TRUECRYPT to backup and encrypt my hard drives and data. It provides excellant encryption algorithms. I always recommend truecrypt to everyone.