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When backing up directly to Object Storage with immutability enabled using Veeam Backup & Replication 12.x, an increase in API callsspecifically PutObjectLockRetention to the Object Storage is noticed. This behavior is observed when using either a simple Object Storage Repository or when targeting a Scale-Out Backup Repository that uses an Object Storage Repository as its Performance Tier. The spike in API calls occurs at regular intervals, typically around every 10 days or 30 days for AWS S3 and IBM cloud storage.
This situation is caused by the way in which backup file immutability is maintained by Veeam Backup & Replication 12.x when using Immutable Object Storage as a primary backup destination. As explained in the How Block Generation Works section of the User Guide, Veeam Backup & Replication utilizes Block Generations to extend the immutability of groups of backup files in intervals. This approach is implemented to reduce I/O operations with the storage over time.
The immutability extension API calls occurring on an interval is behavior by design. More information can be found here: How Block Generation Works.
Veeam Backup & Replication 13 Improvements Starting in Veeam Backup & Replication 13, improvements were made to the handling of immutability-related API calls, which will significantly reduce the number of API calls that occur.
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