need some help! can't backup using Nandroid

Hey guys, android noob here, just converted to the Samsung Vibrant from a blackberry not long ago.

I was gonna try and go the custom ROM route, but i've hit a speed bump. i'm rooted and i installed ROM manager, but i cannot get it to make a backup. when i boot into recovery mode the only options available are these:

-reboot system now
-reinstall packages
-delete all user data
-delete cache data
-format internal sd card

i read somewhere to keep trying "reinstall packages" and that would do it, but every time i do i get this:

E:failed to verify whole-file signature
E:signature verification failed
Installation aborted.

i've tried older versions of CWM, i've uninstalled and reinstalled ROM Manager, i've searched the web for 2 hours for an answer. i'm at a loss. i'm not going to flash a ROM until i get a proper backup made.

any insights?


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