At the Time Machine preference pane, go to Select Disk... and select the disk you're currently using for backup. Check the checkbox in this dialog to Encrypt backup disk. Give it a good password, and never lose it. You probably won't need it ever again unless you recover the backup from a different machine, so remembering it would be tricky.
Requirements for encryption are just Mac Extended (Journaled) file system on a GPT-partitioned disk. I'd speculate it uses the same method as FileVault2, but I don't know.
It does appear to be non-destructive. When I enabled it, it did a long 'preparing for encryption' step (probably a check disk), a quick backup, and now its sitting there encrypting. It is taking a while too, so it might encrypt the whole file system, which will block recovery from anything older than Lion.
Post experiences below. Just to be safe, have ano ...
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