Why can't I backup my ROM?

I have LG p769 from T-Mobile (rooted) with stock rom, using android 4.1.2. I want to install Cyanogenmod, which doesn't support LG p769 but does support LG p760. I want to try if it works. I backed up app data and system data using titanium backup. After that I tried Rom Manager but it couldn't install cwm because my phone was not supported. I have looked all over the web and couldn't find anything. Can someone please tell me why I can't backup a rom on my phone? Thank you.

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