Continuous Backups are not supported on v4.2 clusters in Atlas, and consequently if you upgrade a v4.0 cluster that uses Continuous Backups to v4.2 via the UI, this automatically selects the Cloud Provider Snapshots backup option. You are also allowed to save the changes -- see this recording: https://share.getcloudapp.com/z8unKjnB This could could result in unwanted changes if someone is trying to upgrade a cluster to 4.2, but doesn't intend to use Cloud Provider Snapshots. Instead, a warning should be displayed if the v4.2 version option is selected when making changes on a v3.6-4.0 cluster that already uses Continuous Backups -- the user making the changes should confirm that they intend to use Cloud Provider Snapshots before being allowed to proceed with updating to v4.2.