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F OpenNebula/one#7630: Update backup system overview table (#634)
The table in the [Backup System Overview](https://docs.opennebula.io/7.2/product/cluster_configuration/backup_system/overview/) has been converted from HTML to markdown to better match other tables in the documentation in terms of style. (cherry picked from commit c6bf430)
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‎content/product/cluster_configuration/backup_system/overview.md‎

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<!--# Overview -->
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Here you will find details on how to configure the available backends for [Virtual Machine Backups](../../virtual_machines_operation/virtual_machine_backups/). Backups are managed through the datastore and image abstractions, so all of the concepts that apply to these objects, such as access control or quotas, are applicable to backups.
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Here you will find details on how to configure the available backends for [Virtual Machine Backups]({{% relref "product/virtual_machines_operation/virtual_machine_backups/" %}}). Backups are managed through the datastore and image abstractions, so all of the concepts that apply to these objects, such as access control or quotas, are applicable to backups.
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Define backup datastores by using the available options for backends or datastore drivers:
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- Restic: based on the [restic backup tool](https://restic.net/)
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- Rsync: relies on the [rsync utility](https://rsync.samba.org/) to transfer backup files.
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- OpenNebula-Veeam&reg; Backup Integration: provides robust, agentless backup and recovery for OpenNebula VMs using Veeam Backup & Replication.
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- **Restic**: Based on the [restic backup tool](https://restic.net/).
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- **Rsync**: Relies on the [rsync utility](https://rsync.samba.org/) to transfer backup files.
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- **OpenNebula-Veeam&reg; Backup Integration**: Provides robust, agentless backup and recovery for OpenNebula VMs using Veeam Backup & Replication.
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## Basic Guide Outline
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Before reading this guide, you should have installed your [Frontend]({{% relref "frontend_install" %}}), the [KVM Hosts]({{% relref "kvm_node_installation#kvm-node" %}}) and have an OpenNebula cloud up and running with at least one virtualization node.
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Before reading this guide, you should have installed your [Front-end]({{% relref "frontend_install" %}}), the [KVM Hosts]({{% relref "kvm_node_installation#kvm-node" %}}) and have an OpenNebula cloud up and running with at least one virtualization node.
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To configure your backup system, find about datastore driver options to save your VM backups:
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* [Restic backend]({{% relref "restic#vm-backups-restic" %}})
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* [Rsync datastore]({{% relref "rsync#vm-backups-rsync" %}})
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* [OpenNebula-Veeam Backup Integration]({{% relref "veeam#vm-backups-veeam" %}})
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Then, consult the [Virtual Machines Operation]({{% relref "../../virtual_machines_operation/virtual_machine_backups/operations" %}}) section to find out how to perform, schedule and restore VM backups.
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Then, consult the [Virtual Machines Operation]({{% relref "product/virtual_machines_operation/virtual_machine_backups/operations" %}}) section to find out how to perform, schedule and restore VM backups.
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Finally, if you need to backup a large number of VMs you can manage them [effectively through Backup Jobs]({{% relref "../../virtual_machines_operation/virtual_machine_backups/backup_jobs" %}}).
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Finally, if you need to backup a large number of VMs you can manage them [effectively through Backup Jobs]({{% relref "product/virtual_machines_operation/virtual_machine_backups/backup_jobs" %}}).
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## Hypervisor and Storage Compatibility
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Performing a VM backup requires support from the hypervisor or the disk image formats. The following table summarizes the backup modes supported for each hypervisor and storage system.
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<!-- Markdown doesn't support merged cells in tables, so as a temporary workaround these are inserted in HTML -->
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<table class="docutils align-default">
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<thead>
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<tr class="row-odd">
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<th class="head" rowspan="2"><p>Hypervisor</p></th>
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<th class="head" rowspan="2"><p>Storage</p></th>
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<th class="head" colspan="2"><p>Full</p></th>
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<th class="head" colspan="2"><p>Incremental</p></th>
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</tr>
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<tr class="row-even">
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<th class="head"><p>Live</p></th>
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<th class="head"><p>Power off</p></th>
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<th class="head"><p>Live</p></th>
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<th class="head"><p>Power off</p></th>
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</tr>
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</thead>
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<tbody>
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<tr class="row-odd">
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<td rowspan="5"><p>KVM</p></td>
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<td><p>File<sup>*</sup> (qcow2)</p></td>
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<td><p>Yes</p></td>
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<td><p>Yes</p></td>
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<td><p>Yes</p></td>
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<td><p>Yes</p></td>
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</tr>
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<tr class="row-even">
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<td><p>File<sup>*</sup> (raw)</p></td>
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<td><p>Yes</p></td>
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<td><p>Yes</p></td>
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<td><p>No</p></td>
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<td><p>No</p></td>
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</tr>
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<tr class="row-odd">
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<td><p>Ceph</p></td>
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<td><p>Yes<sup>†</sup></p></td>
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<td><p>Yes<sup>†</sup>
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<td><p>Yes<sup>†</sup>
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<td><p>Yes<sup>†</sup>
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</tr>
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<tr class="row-even">
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<td><p>LVM</p></td>
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<td><p>Yes</p></td>
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<td><p>Yes</p></td>
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<td><p>Yes</p></td>
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<td><p>Yes</p></td>
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</tr>
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<tr class="row-odd">
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<td><p>LVM (File Mode)</p></td>
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<td><p>Yes<sup>‡</sup></p></td>
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<td><p>Yes</p></td>
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<td><p>Yes<sup>‡</sup></p></td>
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<td><p>Yes<sup>‡</sup></p></td>
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</tr>
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<tr class="row-even">
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<td rowspan="4"><p>LXC</p></td>
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<td><p>File (any format)</p></td>
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<td><p>No</p></td>
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<td><p>Yes</p></td>
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<td><p>No</p></td>
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<td><p>No</p></td>
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</tr>
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<tr class="row-odd">
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<td><p>Ceph</p></td>
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<td><p>No</p></td>
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<td><p>Yes</p></td>
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<td><p>No</p></td>
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<td><p>No</p></td>
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</tr>
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<tr class="row-even">
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<td><p>LVM</p></td>
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<td><p>Yes</p></td>
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<td><p>Yes</p></td>
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<td><p>No</p></td>
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<td><p>No</p></td>
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</tr>
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<tr class="row-odd">
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<td><p>LVM (File Mode)</p></td>
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<td><p>Yes<sup>‡</sup></p></td>
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<td><p>Yes</p></td>
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<td><p>No</p></td>
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<td><p>No</p></td>
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</tr>
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</tbody>
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</table>
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Performing a VM backup requires support from the hypervisor and the disk image formats. The following table summarizes the backup modes supported for each hypervisor and storage system.
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| **Hypervisor** | **Storage** | **Live (full)** | **Power off (full)** | **Live (incremental)** | **Power off (incremental)** |
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| --- | --- | --- | --- | --- | --- |
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| **KVM** | File\* (qcow2) | Yes | Yes | Yes | Yes |
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| | File\* (raw) | Yes | Yes | No | No |
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| | Ceph | Yes<sup><strong>†</strong></sup> | Yes<sup><strong>†</strong></sup> | Yes<sup><strong>†</strong></sup> | Yes<sup><strong>†</strong></sup> |
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| | LVM | Yes | Yes | Yes | Yes |
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| | LVM (File Mode) | Yes<sup><strong>‡</strong></sup> | Yes | Yes<sup><strong>‡</strong></sup> | Yes<sup><strong>‡</strong></sup> |
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| **LXC** | File (any format) | No | Yes | No | No |
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| | Ceph | No | Yes | No | No |
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| | LVM | Yes | Yes | No | No |
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| | LVM (File Mode) | Yes<sup><strong>‡</strong></sup> | Yes | No | No |
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<sup>\*</sup> Any datastore based on files with the given format, i.e. NFS/SAN or Local.
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<sup>†</sup> Ceph full and incremental backups are currently stored in a different way, see [backup types]({{% relref "../../virtual_machines_operation/virtual_machine_backups/operations#backup-types" %}}) for more details.
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<sup>†</sup> Ceph full and incremental backups are currently stored in a different way, see [backup types]({{% relref "product/virtual_machines_operation/virtual_machine_backups/operations#backup-types" %}}) for more details.
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<sup>‡</sup> Only supported in [thin mode]({{% relref "../../../product/cluster_configuration/lvm/filemode#lvm-thin" %}}).
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<sup>‡</sup> Only supported in [thin mode]({{% relref "product/cluster_configuration/lvm/filemode#lvm-thin" %}}).

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