On https://www.atlassian.com/trust/security/data-management, Atlassian claims they regularly test their ability to restore products in less than 6 hours.
Can Atlassian’s RDS backups be used to roll back changes? We cannot use our RDS backups to roll back changes. These include changes such as fields overwritten using scripts, or deleted issues, projects, or sites. This is because our data isn’t stored in a single central database. Instead, it is stored across many micro services, which makes rolling back changes a risky process.