Encrypting a TM backup after already started using it?

[kat.hayes]

I have a drive that I have been using as a TM backup and I want to now encrypt it. Is there a way to enable the encrypt option for the TM backup after already setting it up and using it?

Thanks.

 

[chabig]

It's easy. Here's how: http://www.macyourself.com/2011/09/04/how-to-password-protect-and-encrypt-time-machine-backups/