The fact that backupmenu can't backup kernels, is well known - maybe it should be highlighted in backupmenu's readme, or some wiki, to avoid "trap" for new users. Anyway, it's off-topic here, as it doesn't have anything to do with thumb.

Thanks for your question about thumb programs without cssu-thumb (and freeman's answer) - now I understand more about it, I had no idea about never libs being *mandatory* for new toolchain-compiled programs (as opposed to being optional, giving better performance).

/Estel