When you say 'storage', what do you actually mean? Do you mean something more like 'boot from SAN provided disk' perhaps, or 'boot from USB device' or something else?
Do you mean take a backup you can boot/restore from? (Like the lovely AIX
mksysb, HP Ignite and the Solaris one) You might have more joy searching for threads like this:-
Mksysb Equivalent For Linux?
Can you confirm what you actually want to achieve and what hardware you are running on (or virtualisation manager)
Regards,
Robin