In lists.netbsd.current-users you write:
>Even if it won't be put on the next install disk, can someone tell me how to
>create a disk that's bootable to put this utility on (single 1.44MB disk)? 

Just put restore on an ms-dos floppy, then when disaster strikes,
boot your ssto boot/install floppy, ask for shell, mount -t msdos the 
floppy and you have restore handy.

--sjg