Do you know how much space your apps moved to sd take up? Quick System Info doesn't tell you that, but that will also be part of the nandroid backup.
One way of checking: open a terminal emulator and type the following:
du -hs /mnt/asec
In English that command means "disk usage, in human readable format, including subdirectories, for the directory /mnt/asec". /mnt/asec is the mount point for the secure folder that android moves apps to when you move them to sd, so the size it returns tells you how much space those apps are using in addition to your internal space usage.
When I just did that it reported 312.8MB, which is about what I expected from my backups.
du not found...
never mind, i guess the size is big
i will try to buy new SD
thank you for your help