Some Defender Cloud Backup Questions

I currently use Snapshot to backup data to Amazon S3. Would my assumption be correct that I won't even need this anymore when Defender Cloud Backups launch?

Will I be able to backup and restore a single site in a multisite install?

This isn't really an issue but more of a curious question. Are you able to tell us if the cloud backup solution coming to Defender will use Amazon, Google, Azure or something else for storage and if we will have direct access to those backups?

I am really excited for this feature and would be willing to beta test if needed.

Thanks for any information you can provide!