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Finally Veeam has released on the patches portal both Veeam Backup & Replication 9.0 Update 1 (build 220.127.116.111) and Veeam ONE v9 Update 1 (build 18.104.22.1688).
For Backup & Replication note that after installing the update, during the first start of the Veeam Backup Service, required modifications will be made to the configuration database automatically to optimize its performance. These modifications may take up to 10 minutes to complete. Please do not reboot the Veeam server, or attempt to stop the service during this operation.
For more information see the release notes: