Have you tried just flashing the rootfs, if you stick to flashing the rootfs what is on MyDocs will be left untouched, not sure about data on the home partition (like messages and contacts) as I think it clears some stuff on first boot after a rootfs flash.

You can access the whole contents of the eMMC to rescue your data by following the guide here to boot the Meego rescue kernel. You'll need to do this from a linux computer but you don't need to install linux, you can just boot a linux live cd/usb or probably even use a VM.