Support for reverse cache (when source is not available)

[leroy0211]

When the source filesystem is not available (eg: AWS is down) I would like to have the ability to save things in a temporary filesystem (like Local).
When the source filesystem comes back online, the temporary files should be moved to the source filesystem. For example in a cron.

Something like a "reversed cache"!?

Or if someone already knows of a way how to do this with Gaufrette, that would be great!

[markmbain]

+1