An administrator has automated backups enabled for an Amazon RDS for PostgreSQL instance with a 7-day retention period, but no automated snapshots have been produced for over a month. What is a likely explanation for the absence of automated backups?

When an Amazon RDS for PostgreSQL instance enters the STORAGEFULL state, it can no longer perform automated backups. This is because there isn't enough storage space available on the instance to create the necessary temporary files or write the backup data. The instance needs sufficient free space to complete the backup process successfully. Incorrect options: The Amazon S3 bucket that stores the backups is managed by AWS and has virtually unlimited storage; users do not manage its capacity directly. Multi-AZ configuration enhances availability but is not a prerequisite for automated backups. Single-AZ instances also have automated backups. The backup retention period can be set from 0 to 35 days. A 7-day retention period is valid and does not prevent backups.