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My main OS is Ubuntu and I am using windows 10 in Virtualbox. I am trying to create a backup image of my windows 10 Virtualbox Machine so I will be able to install that backup to my other physical laptop. When I tried to back up to my virtualbox shared folder(\VBOXSVR\Downloads) I get the following error:

enter image description here

I tried the following, no one does work.

1. I open up services.msc and switch to the Automatic the followings. But it didn't work.:

  • Block Level Backup Engine Service

  • Remote Procedure Call (RPC) Locator

  • RPC Endpoint Mapper

  • Windows Backup

2. I ran the Check Disk to fix disk errors.

3. Checked that decimal symbol is set to .(dot)

4. Added registry key to the Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\SystemCertificates

Registry Key Name:CopyFileBufferedSynchronously

Value:1

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2 Answers 2

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Try mapping a network drive instead of using UNC. In a cmd prompt type

net use x: \\vboxsvr\downloads, then point the backup to x:

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    Thanks.net use x: \\vboxsvr\downloads command is successfully executed but backup windows doesn't allow to use x: for backup.imgur.com/a/aUMzVdw
    – my-lord
    Oct 26, 2018 at 19:52
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I know this is old, but I had the same issue going through the control panel. I got it to work when I found the cli to create a system image. Also, it doesn't accept mapped drives, had to use UNC path.

  1. Start cmd/powershell as administrator
  2. Enter: wbadmin start backup -backuptarget:\\127.0.0.1\myshare -include:c: -allcritical -quiet

The page I found the information: https://answers.microsoft.com/en-us/windows/forum/all/creating-a-system-image-for-back-up-by-using-the/04246478-b885-48dd-bc81-40190e6c5236

Also

https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/wbadmin-start-backup

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