So I've got this 500GB external which I'm planning to encrypt and store data and backups on and the two viable encryption software that comes to mind are FreeOTFE and Truecrypt. The question is, if I excrypt the entire partition will I need to have Truecrypt/ FreeOTFE installed on each computer/laptop that I plug the external drive on? Say I encrypted the partition using Desktop A using Truecrypt, will I need Truecrypt to be installed on Desktop B for me to have access to the encrypted partition? One more thing, which drive backup program do you use to backup a system drive unto a Truecrypt encrypted partition? And I surmise that backups are limited to online backups since the encrypted drive needs to be mounted first right?