Seems what that means is you do not have the sd card formated to extJust curious, is ext backup and .android_secure important? i tryed to run the option with all and i got Error :run 'nandroid-mobile.sh' via adb.
just doing Nand backup alone worked perfectly.
if the others arnt important i wont bother with it
Its not from lack of space on Sdcard since i have 14Gb free
So no its not important.
You do not need it formated to ext however some are working on a way to format part of the card to linx style ext2 and ext3 filesystem to allow the phone to use part of the card for internal memory. And virtual memory.
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