Just use the OTA instructions of the first post. OTA using SSH. The update can be slow. 2.0.0.10 to 2.0.2.4x took about 3hours. If the update process hangs at a package fir more than 5 minutes, abort the update with CTRL+C, type "sync" and reboot. Most of the time you have to hard reset your device. When its back up, SSH into it and continue the update with version --dup. If it hangs again repeat the above steps. I didn't update my main SFOS installation because not all patches i need are available.

If you don't use Multirom, ciuldn't you do a full backup with TWRP before updating?