Reboot system now :: Self explanatory.
USB-MS toggle :: USB Mass Storage.
Mounts the SD card
Backup/Restore (See NANDroid backups
for more information)
Nand backup :: Creates a backup of /
system, /data, /boot, /cache, and /
sdcard/.android_secure (on SD card)
Nand + ext backup :: Creates a Nand
backup plus /sd-ext ( apps2SD) (on SD