Ephemeral storage PaaS, flysystem?

I am considering to use flysystem with a PaaS for a client project. The client shall be able to use the admin plugin to modify texts. But: the PaaS has an ephemeral storage (12-factor), which means local modifications will be viped during the next install.

What do you suggest? Is there a way to integrate flysystem or something else?

I think no one ever experimented Grav on such a system. Would be a nice plugin :)