Export Image

Topic

This article describes the Export Image feature of the Datto SIRIS user interface.

Environment

  • Datto SIRIS
  • Datto ALTO

Description

The Export Image function allows you to export a recovery point from your Datto appliance as a VHD, VHDX, RAW, VMDK, or VMDK-linked virtual hard disk.

IMPORTANT  Do not use the image export function as a server imaging tool. It is meant to restore downed servers. This restore process is not a deployment tool.

Technical Notes

  • Image Export for ReFS is currently unsupported. Any ReFS volumes in the selected snapshot get excluded from the restoration. To perform a restore of a ReFS volume, use the Volume Restore feature.
  • Before restoring a Rescue Agent, you'll need to first gracefully shut down the virtual machine from within the operating system. Then take a snapshot of it from the protect tab of the Datto device to use for your restoration. Failure to take this step will produce dirty images as rescue agent snapshots are non-quiescing.
  • EFI system partitions are not included in the backup, but are recreated during the restore process. If this partition is non-standard, as in the case with the patches release by Microsoft of systems effected by the vulnerability CVE-2023-24932, the partition would be created standardly. In cases like these, please reach out to Microsoft on re-applying the patch if desired.

Getting Started

  1. To start an Image Export, connect to the Datto Device's UI.

  2. Select Restore from the main menu.

  3. Select the Agent to restore from.

  4. Select the Export Image option and choose a recovery point.

  5. Click Start Image Export.

  1. Specify a destination and format for your image.

  1. Select the Destination for the export:

    • Network Share: lets you export an image via CIFS/Samba or NFS. All image files are always thin-provisioned on the Datto. However, if the tool used to copy the image files to local storage does not accommodate thin provisioning, they will be copied as thick-provisioned. Therefore, make the appropriate storage considerations when copying files to a virtual host or other destination.

      IMPORTANT  NFS shares containing Image Exports are writable. Do not write production data to the share, as this could lead to data loss when you unmount the image export.

    • USB (SIRIS only): lets you export an image to an attached USB drive. These are thick-provisioned and can expand to the maximum size of the attached disk.

      You can only have one USB drive attached to the device to use this feature, this includes virtual drives

  1. Select the Export format. The Time Requirements listed below represent the amount of time the Datto appliance will need to create the export, not the amount of time it will take to transfer the export to your hypervisor. All times shown are estimates and can vary depending on system overhead and resource availability.

    • VMDK-linked: Raw disk image with VMDK pointer file.
      Files produced: A single-drive system results in 4 files; boot.datto, boot.vmdk, C.datto, and C.vmdk. A fifth file, configuration.vmx, will also be present if you are restoring an agentless VMware-based system. When restoring a virtual machine, you must attach boot.vmdk as the first drive in the boot order, and C.vmdk as the second drive.
      Time Requirement: Instantaneous

    • VMDK: Compacted complete VMDK image (supports resizing and other advanced VMFS features).
      Disk Space Required: VMDK image exports require approximately 200 MB of free disk space on the destination hypervisor.
      Files produced: A single drive system results in 1 file: C.vmdk. A second file, configuration.vmx, will also be present if you are restoring an agentless VMware-based system. The boot volume will always be the first volume of the image export; when restoring a virtual machine, you must attach this as the first drive in the VM configuration.
      Time Requirement: Instantaneous

    • VHD: Converted raw to VHD.
      Files produced: A single drive system results in 2 files; boot.vhd and C.vhd.
      Time Requirement: Instantaneous

    • VHDx: Compacted complete VHDx image
      Files produced: A single drive system results in 1 file; C.vhdx.
      Time Requirement: Instantaneous

    • RAW: Uncompressed RAW disk image
      Files produced: A single drive system results in 1 file; C.raw
      Time Requirement: Instantaneous

  1. Select the Boot Type you would like the image export's boot sector to reflect. The available options are Auto Detect, UEFI, or BIOS. Datto only recommends using Auto Detect if the boot sector format of the production machine is not known.

    See the Technical Considerations section of this article for additional information about these options.

  2. After configuring the restore, click Export.

    If Network Share was chosen, proceed to the Exporting to a Network Share section of this article.

    If y USB is chosen, connect a USB drive large enough to store the exported image, and proceed to the Exporting to a USB Drive section.

  1. When exporting to a network share, your Datto appliance will create a shared folder on your network which matches the hostname or IP address associated with the restore. You can access the exported image via the CIFS/Samba path or the NFS path your Datto appliance displays once the export has been created and is available.

  2. When you finish with the restore, be sure to unmount and remove it to preserve network resources and allow regular backup and retention activity for the agent to continue on your Datto appliance.

  1. If selecting Export to USB drive, you will see the following:

  • When selecting Copy Images to Disk, the Datto appliance will copy the images in their raw size to the USB drive.
  • When selecting Expand Image to Disk, the Datto appliance will copy a single image to the USB drive and expand it to the full size of the disk. The Datto device will resize the image to the minimum possible size during the copy process to optimize the transfer.

Technical Considerations

  • When restoring a virtual machine from VMDK-linked, you must attach boot.vmdk as the first drive in the boot order, and C.vmdk as the second drive. Adding drives in this order fixes virtualization failures for some MBR and BIOS-based agents, including NTFS bootstrap code corruption, which may typically be ignored by production agents since Windows uses a 'system reserved' partition for booting by default.
  • Multiple images cannot be exported to the same USB device because the process formats the USB drive at the beginning of each export. If you want to save multiple Image Exports on the same USB device, you will need to save each export to a network share, then plug the USB device into a computer on the same network, and copy the images from the network share to the USB device.]

Which VMWare file format should I choose?

  • Choose VMDK if you have at least 200 MB of free disk space on the destination hypervisor and if you would like to have the ability to expand the disk size of the virtualization's VMDK files in the future.
  • Choose VMDK-linked if storage space considerations on your hypervisor are a concern, or if you have to perform a USB transfer of the image export to the datastore on your hypervisor (see the Limitations section of this article for more information), and if you will not need to resize the virtualization's disks in the future.

IMPORTANT  Do not select VMDK-linked if you will need to expand the disk size of the system's VMDK files in the future. The VMDK created during the VMDK-linked export process is a fixed file which references .datto files generated by your Datto appliance. It is not capable of resizing to increase available storage space.

Which Hyper-V file format should I choose?

  • If none of the protected host's volumes exceed 2 TB, you can use either VHD or VHDx.
  • For volumes larger than 2 TB, you must perform a VHDx image export, as VHD virtual disk files do not support volumes larger than 2 TB. For Hyper-V exports, determine in advance which generation of VM your environment requires. Select VHDX with UEFI Boot for Generation 2 or VHD with BIOS boot for Generation 1. For more information on OS compatibility, refer to this Microsoft article (external link).

Additional Resources

Restoring to Citrix Hypervisor (XenServer) using VHD / VHDx

Restoring to Hyper-V using VHD / VHDx

Restoring to VMware ESXi using VMDK