{
 "if": {
  "properties": {
   "Engine": {
    "pattern": "^(?!aurora).*$",
    "type": "string"
   },
   "SourceDBInstanceIdentifier": false
  },
  "required": [
   "Engine"
  ],
  "type": "object"
 },
 "then": {
  "required": [
   "BackupRetentionPeriod"
  ]
 }
}
