RM, via Clockwork, as well as SPrecovery for that matter, make backups that you can restore. Said restorations need to get past the bootloader. With that currently locked down on the DX (last I knew it still was locked....these things can change quickly!) you wouldn't be able to do a restore.
Folks are working on unlocking that bootloader. At that time I'm sure Rom Manager and other similar tools will be available for the DX so backups and recoveries can be made.