The goal of this project is to eliminate the need for the average user to do anything beyond backing up their seeds. You can certainly put the descriptor on Nextcloud or a hosted cloud provider, but you're creating unnecessary risk. If the data gets purged, or if you die and your heirs don't know how to access it, your funds could be lost.

A 2-of-3 multisig should be recoverable with only 2 seeds - anything else is an added liability.