File Share Encryption

https://www-secure.symantec.com/connect/pt-br/forums/encrypting-bootable-clone 

I recently read the above link on how to create an encrypted bootable backup clone hdd for my mbp.

I am confused as to how one would update incrementally the encrypted backup clone hdd via usb cable.

Could some one explain to me how this is accomplished?

Ive used truecrypt on my windows-based laptop where I can just simply clone the laptops encrypted internal hdd over to an external hdd, but pgp encryption for mac has me confused as to how this would be done.

My purpose is to have an updated encrypted backup clone hdd that I can simply drop into my mbp should the internal hdd fail.

Thank you.

After doing the initial clone, and excluding /PGPWDE01 and /PGPWDE02, encrypt the external disk (you may need to change to firewire - as I recall, there's bugs with bootable USB disks).

Then you can incrementally update it by excluding those two files, and choosing 'protect root level items' on the target, and choosing an incremenetal backup.

Make sure you test it every time you do a clone.

I *strongly* recommend having one unencrypted backup/clone.  PGP's not reliable enough to have all your eggs in that basket (and yes, that's a change from early comments I made).