With all the clouds dissipating recently I Have been thinking, for us that run vfs cache it would be nice if there was a rclone command like
rclone export remote: /path
where rclone would export all the files it has 100% of the content to it, and maybe files with sparse content could be exported too but with suffix and if you had other caches in other servers, if it would be possible for another rclone cache to rebuild the sparse files if they have what is missing.
This would turn the rclone vfs cache as last resort backup if everything goes wrong. If this is really hard to do then maybe a flag --no-sparse-files that would make rclone always download the entire file to disk, but without performance loss