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TLDR: First snapshot is full then forever incremental. AWS hides the size of the snapshot. Your only estimate is the bill.
This is an issue with EBS snapshots, not directly AWS Backup. AWS uses black magic and doesn't tell you what actually happens. You are correct in that the first snapshot of a volume, whether via EBS snapshot or AWS Backup [which is EBS snapshot anyway], will be full and then forever incremental. The size shown for the snapshot is always the full size of the volume. The only way you can get any information is in the Billing dashboard for the total EBS snapshot cost. Snapshots only backup data, then the deltas, and I think there is a form of compression, so, yeah ... black magic.
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Hello.
Thank you for your answer.
It is black magic xD
Additional comment, I understand the first backup will be full, and then incremental backups, it means no more full backups, only the first time.