The size discrepancy between the SharePoint admin center and the DropSuite backup reports can be attributed to versioning.
The key difference lies in how we calculate these numbers:
In our approach, we only consider the latest version of files present in the most recent snapshot, which naturally results in a lower data volume. In contrast, Microsoft appears to aggregate the sizes of all versions of files, leading to larger reported volumes.
Additionally, the higher file count on our end is due to certain limitations. Sometimes, the delta tracking mechanism cannot identify deleted files or folders, so they continue to be counted in the latest snapshot. Moreover, not all sites contain a significant number of files in the system library, such as form templates, which can also affect the file count.
Also, if a retention policy is set and has taken effect on the data, there will be a size discrepancy.
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