The last thing an organization wants to hear is that their backup data has been compromised.  While it’s understood that backups are the last line of defense against Ransomware, how do you ensure that the data is safe and recoverable? Immutable Storage, as part of an overall secure backup solution, plays an important role especially considering attackers are targeting the backup infrastructure.  While the concept is easy to understand, data cannot be deleted from an immutable solution, there are many considerations to factor in when looking at immutable storage.  These considerations include whether to use on-premise or cloud storage, recovery time objective (RTO), sizing requirements and costs.