AWS Backup Deletion

If you want to retain the backup for a longer period after creating the backup, you can change the retention period for specific backups. https://docs.aws.amazon.com/aws-backup/latest/devguide/editing-a-backup.html

If your question is to delete the specific files in a backup(recoverypoint). There is no way to delete specific files inside a backup. The only option is to delete the whole backup.

Hello,

On the fifth day everything will be deleted in source account and also the backup remote account then a fresh full backup will happen.

This is not entirely accurate. On Day 5, only data specific to the initial backup created on Day 1 will be removed. Incremental data that is referred to (needed by existing backups) will still be retained. Backups created on Day 2,3,4 will be retained and deleted accordingly over the next couple of days.

The below documentation details incremental nature of backups in EBS. But is a good reference to understand how the data is linked for incremental backups in general https://docs.aws.amazon.com/ebs/latest/userguide/ebs-snapshots.html#how_snapshots_work

What if I want to delete the files according to date.

To achieve this use-case, you can delete the corresponding backup (recovery point) which was created on the specific date. Doing so will remove any relevant data that is unique to that given day. Meaning, only data which is not needed by any other existing backups will be deleted https://docs.aws.amazon.com/aws-backup/latest/devguide/about-backup-plans.html https://docs.aws.amazon.com/ebs/latest/userguide/ebs-deleting-snapshot.html#ebs-deleting-snapshot-incremental