Libra Colour what can be recovered with the manual reset?

[Leviticoh]

Hi, i'm playing around with my ebook reader right now,
i got code to run on the device, cross-compiled dropbear and lua and installed them,
it's fun and i'd like to mess more with the system,
like disabling nickel and making my own software to put stuff on the screen.

But seeing that it doesn't have an sd card slot i think i can't just take a disk image now and slap it back in when i break something,
so i was wondering if i can trust the manual reset procedure described by kobo as a safety net in the case i break inittab or the rcS script,
or should i just leave them alone and find some other way?