Does CPM backup ephemeral storage?

Does CPM backup ephemeral storage?

The answer is no, CPM does not backup the ephemeral storage.
CPM utilizes native AWS snapshots, and they do not support ephemeral storage.

Ephemeral storage is not meant for persistent data. That said, in some setups, to leverage the speed of that storage, customers setup databases on ephemeral storage with asynchronous mirroring to EBS volumes. The EBS volumes are used to create the snapshots.