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In the backup properties, the “Data Size” or “Backup Size” is larger than expected, or the “Deduplication” column in the backup statistics is different from the ratio reported by duplicating storage appliances.
Veeam Backup & Replication does not request information from storage appliances about the size of files as stored on the appliance. All values in this user interface would be the same if the data were written to non-deduplicating storage. This limitation applies to all storage, whether integrated (HPE StoreOnce, EMC DataDomain, ExaGrid) or not.
This user interface correctly reflects the backup file contents and works as designed.
This article's description of the backup file format is simplified for clarity. “Backup Size” may be larger than the data stored within the VM with the default settings for storage appliances (4 MB blocks, no inline deduplication, decompress before storing), even after accounting for deleted or hidden files. This is because of the large block size: a 4 MB block containing minimal data will still contribute 4 MB to the Backup Size. The storage appliance will deduplicate this space.
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