There is a belief by many that Service Level Agreements (SLAs) are just are not worth the effort. Instead an SLA allows a conversation prior to something going wrong that defines what can and can’t be done from a storage and recovery standpoint. Without a written SLA in place it is almost impossible to know what standard of storage and protection should be applied to which data set. The result is a one size fits all data protection policy which can be expensive or not bring adequate protection to critical applications.”]
Source: https://www.darkreading.com/database-security/slas-can-make-life-easier