Option to encrypt time machine network disks not available

I have two MBP' (Os10.8.4) machines that backup over a network to a MM running 10.6.8 retail.
In TM the box to encrypt the backup is grayed out.  I read in Pondini' excellent instructions ( http://pondini.org/TM/31.html ) that it is only available in 10.8. as said, the MBP' are on 10.8.4.
Would this mean that because my MM is running 10.6 it is not available?  seems not logic to me, but can someone confirm this or tell me the workaround/fix?
Thanks

It probably has to do with how the encryption software is written in 10.6 OS software. I would go with Pondini's
article.

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