The Platform API lets us trigger app backups (/app/manage/takeBackup) and track the operation, but there's no way to retrieve a backup's size or list an app's backups/restore points — support confirmed backups live on S3 and size isn't exposed (ref: my recent ticket on this).

As a workaround we currently approximate backup size from the app's disk usage (/server/{id}/diskUsage?app_id=… → app.home + app.mysql), but that's the current footprint, not the actual backup size or history.

Request: an endpoint (or fields on the existing backup operation) returning per-backup size, timestamp, and a restore identifier, and an endpoint to list an app's available backups. This would let backup-management tools show real size and history to customers.