Hi there. Can you confirm which steps you have so far tried?
To access the Nandroid backup / Recovery menu you need to flash the Amon RA image. To do this you need FlashRec (see above instructions).
So read
this BUT please be aware to follow these instructions you need to have done the
following steps.
(ONLY STEPS 1-5).
When this is done hopefully you can access the recovery menu where you can backup your phone... If not see below..
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When you attempt to do the above, if there is a problem ask yourself the following question(s)
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Does it let me flash the recovery in the Flashrec app? (Does it actually say successful, etc.?)
If not, try using a different version of Flashrec. 1.1.3 (the latest). If that fails, try 1.1.2
let me know what happens... thanks