Pulling flash image off device

[Craig Woodward]

This may seem trivial, but I can't seem to find anything on how to do this directly.

Is there an easy way to pull my existing fs flash image OFF my phone so I can save the current config?  I want to have a backup so if I add a package or do an upgrade later that toasts my phone I don't have to start from square one again. ;)  I could probably remount the root as ro, and DD it out via ssh or to the mmc.  But is there anything I have to do otherwise to make it valid in dft-uilts eyes?