In Veeam Backup & Replication, to utilize AWS S3 Glacier for long-term storage, the AWS S3 must first be added as a Capacity Tier within the Scale-Out Backup Repository (SOBR). This step is necessary before backups can be moved to Glacier. Once S3 is established as the Capacity Tier, the policies for moving backups to Glacier can be configured based on the retention requirements (in this case, after 90 days). This approach ensures that the monthly full backups are initially stored in S3 and then offloaded to Glacier for cost-effective long-term retention.References:
* Veeam Documentation: Scale-Out Backup Repository
* Veeam Help Center: AWS S3 as Capacity Tier and Archive Tier Configuration