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Potential data loss when using Instant VM Recovery


Performing Instant VM Recovery in VMware vSphere environments may result in data loss when using the quick migration feature to move published VM disks to production storage to finalize the recovery. This issue was identified internally by Veeam quality control in late 2019, and the fix was included (among others) in version 20191210 of Update 4b. However, no support KB article was created to highlight that this particular issue was fixed, because its scope was originally thought to be much smaller.

Your environment is not affected if:
  • Your VMware vSphere license includes the Storage vMotion feature because in this case, Veeam will finalize Instant VM Recovery using this technology, OR
  • You installed Update 4b after the update availability notification in Veeam Backup & Replication™ console in January 2020 (or in December 2019 through the 20191210 distribution package).

If you aren’t in the situation described above, you are strongly advised to schedule a maintenance window promptly and apply the update as soon as possible.
  • If you upgraded to Update 4b prior to version 20191210 availability, or if you are not sure when you upgraded, please download and install the patch from this KB article.
  • If you are running Update 4a (build or Update 4 (build, please download and install Update 4b 20191210 from KB2970 (or from Veeam web-site).


  1. Download the patch and extract ZIP file to your backup server.
  2. Check the current version of Veeam Backup & Replication. It must be (Update 4b).
  3. Make sure that no jobs are running and close the console.
  4. Right-click on the installation file and click "Run as administrator".
  5. Go through the setup wizard to deploy the patch.

More information

This patch is a cumulative hotfix rollup for Veeam Backup & Replication Update 4b which also includes the following previously released hot fixes in the single package:
  • Backup to Tape Jobs fail with “Tape Error: 1117” (KB2983)
  • Potential data loss during Export Backup retention processing (KB3039)


MD5 for 16e93eb835dfafceb6b60f31450de9d8
SHA-1 for ca9ee800f532a4dd2b240fdd19583db238d05fdb
Veeam Backup & Replication, Veeam Cloud Connect
9.5 U4b
Last Modified:
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