Mark for non-sync, offline only data

I know there is work planned to support filtered sync, I'm adding some of my thoughts on features that might be useful:

1. Being able to mark a specific record to not be synced locally.
2. Being able to mark a specific record to store the DATA only remotely.

Both of these will allow me to have larger files stored only online/server and not on the lighter client devices.

The second option allows me to keep metadata in sync, but the data itself is offloaded and doesn't have to be stored local on device.

Another option is to have either a size-rule for when to store data off-device or not.