Allows to share Cloud Provider Backup Snapshot with customer's Cloud Provider account
What is the problem that needs to be solved? Add an option (as it was in mLab) that allows to share the Cloud Provider Backup Snapshot (EBS Snapshot [1], in case of AWS) for Atlas Cluster with customer's Cloud Provider account. This action is easier, quicker and cheaper for customers than manually downloading the Atlas Snapshot.
Why is it a problem? (the pain) A) Operational pain: as of now (2020-02-18), if you require to execute disaster recovery scenario with restoration of your Atlas Cluster data outside of Atlas Clusters you'll need to create a Cloud Provider Backup Snapshot Restore job (POST /groups/[GROUP-ID]/clusters/[CLUSTER-NAME]/backup/restoreJobs/
Public API call [2]), then wait until that job will be finished and then manually download Atlas Snapshot(s) via HTTPS; B) Additional cost associated with manual restoration procedure: in order to know which Backup Snapshot file is related to which Shard/CSRS you'll need to download it, untar and check mapping.
[1] https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSSnapshots.html
[2] https://docs.atlas.mongodb.com/reference/api/cloud-provider-snapshot-restore-jobs-create-one/
