CloudFormation template to configure thin backup rules for AWS Backup

cloudformation-template-for-aws-backup-thin-backups.yaml

AWSTemplateFormatVersion: "2010-09-09"
Description: "Backup Plan template for thin backups"
Resources:
  BackupVaultWithThinBackups:
    Type: "AWS::Backup::BackupVault"
    Properties:
      BackupVaultName: "BackupVaultWithThinBackups"

  BackupPlanWithThinBackups:
    Type: "AWS::Backup::BackupPlan"
    Properties:
      BackupPlan:
        BackupPlanName: "BackupPlanWithThinBackups"
        BackupPlanRule:
          -
            RuleName: "RuleForDailyBackups"
            TargetBackupVault: !Ref BackupVaultWithThinBackups
            ScheduleExpression: "cron(0 5 ? * * *)"
            Lifecycle:
              DeleteAfterDays: 7
          -
            RuleName: "RuleForWeeklyBackups"
            TargetBackupVault: !Ref BackupVaultWithThinBackups
            ScheduleExpression: "cron(0 5 ? * 1 *)"
            Lifecycle:
              DeleteAfterDays: 28
          -
            RuleName: "RuleForMonthlyBackups"
            TargetBackupVault: !Ref BackupVaultWithThinBackups
            ScheduleExpression: "cron(0 5 1 * ? *)"
            Lifecycle:
              DeleteAfterDays: 90
    DependsOn: BackupVaultWithThinBackups

  TagBasedBackupSelection:
    Type: "AWS::Backup::BackupSelection"
    Properties:
      BackupSelection:
        SelectionName: "TagBasedBackupSelection"
        IamRoleArn: !Sub "arn:aws:iam::${AWS::AccountId}:role/service-role/AWSBackupDefaultServiceRole"
        ListOfTags:
         -
           ConditionType: "STRINGEQUALS"
           ConditionKey: "backup"
           ConditionValue: "thinbackup"
      BackupPlanId: !Ref BackupPlanWithThinBackups
    DependsOn: BackupPlanWithThinBackups          
        

Is it all using the default role and dynamodb? What if someone uses a default vault?

This CFn template is intended for basic/default usage.
Please customize it for your specific use case.