Immutability of the offsite backups is a constraint on this project.

The additional condition of the offsite backup that is presumed by the immutability requirement is that a copy of backup data must reside in a public cloud local to each region. Immutability means that the backup data cannot be modified, deleted, or overwritten by anyone, including the backup administrator, the cloud provider, or malicious actors1. Veeam Backup & Replication v11 supports immutability for backups stored in Amazon S3 and Microsoft Azure Blob Storage, using the Object Lock feature2. Therefore, the offsite backup must use one of these cloud providers, and must be located in the same region as the source data, to comply with the data locality and privacy laws. The other options are not related to the immutability requirement, as they are either already stated in the business requirements (option A), technical requirements (option B), or not relevant for the Veeam solution (option C). References: Immutability, Object StorageImmutability.