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Integrating Proxmox Backup Server into Proxmox Clusters

Proxmox Backup Server

In today’s digital landscape, where data reigns supreme, ensuring its security and integrity is paramount for businesses of all sizes. Enter Proxmox Backup Server, a robust solution poised to revolutionize data protection strategies with its unparalleled features and open-source nature.

At its core, Proxmox Backup Server is a comprehensive backup solution designed to safeguard critical data and applications effortlessly in virtualized environments based on Proxmox VE. Unlike traditional backup methods, Proxmox Backup Server offers a streamlined approach, simplifying the complexities associated with data backup and recovery.

One of the standout features of Proxmox Backup Server is its seamless integration with Proxmox Virtual Environment (PVE), creating a cohesive ecosystem for managing virtualized environments. This integration allows for efficient backup and restoration of Linux containers and virtual machines, ensuring minimal downtime and maximum productivity. Without the need of any backup clients on each container or virtual machine, this solution still offers the back up and restore the entire system but also single files directly from the filesystem.

Proxmox Backup Server provides a user friendly interface, making it accessible to both seasoned IT professionals and newcomers alike. With its intuitive design, users can easily configure backup tasks, monitor progress, and retrieve data with just a few clicks, eliminating the need for extensive training or technical expertise.

Data security is a top priority for businesses across industries and Proxmox Backup Server delivers on this front. Bundled with solutions like ZFS it also brings in all the enterprise filesystem features like encryption at rest, encryption at transition, checksums, snapshots, deduplication and compression but also integrating iSCSI or NFS storage from enterprise storage solutions like from NetApp can be used.

Another notable aspect of Proxmox Backup Server is its cost effectiveness. As an open-source solution, it eliminates the financial barriers (also in addition with the Proxmox VE solutions) associated with proprietary backup software.

Integrating Proxmox Backup Server into Proxmox Clusters


This guide expects you to have already at least one Proxmox VE system up and running and also a system where a basic installation of Proxmox Backup Server has been performed. Within this example, the Proxmox Backup Server is installed on a single disk, where the datastore gets attached to an additional block device holding the backups. Proxmox VE and Proxmox Backup Server instances must not be in the same network but must be reachable for each other. The integration requires administrative access to the datacenter of the Proxmox VE instance(s) and the Backup Server.


Administration: Proxmox Backup Server

Like the Proxmox VE environment, the Proxmox Backup Server comes along with a very intuitive web frontend. Unlike the web frontend of  Proxmox VE, which runs on tcp/8006, the Proxmox Backup Server can be reached on tcp/8007. Therefore, all next tasks will be done on https://<IP-PROXMOX-BACKUP-SERVER>:8007.

After logging in to the web frontend, the dashboard overview welcomes the user.

Adding Datastore / Managing Storage

The initial and major tasks relies in managing the storage and adding a usable datastore for the virtualization environment holding the backup data. Therefore, we switch to the Administration chapter and click on Storage / Disks. This provides an overview of the available Devices on the Proxmox Backup Server. As already being said, this example uses a dedicated block storage device which will be used with ZFS to benefit from checksums, deduplication, compression which of course can also be used in addition with multiple disks (so called raidz-levels) or with other solutions like folder or NFS shares. Coming back to our example, we can see the empty /dev/sdb device which will be used to store all backup files.

By clicking on ZFS in the top menu bar, a ZFS trunk can be created as a datastore. Within this survey, a name, the raid level, compression and the devices to use must be defined. As already mentioned, we can attach multiple disks and define a desired raid level. The given example only consists of a single disk, which will be defined here. Compression is optional, but using LZ4 as a compression is recommended. As a lossless data compression algorithm, LZ4 aims to provide a good trade off between speed and compression ratio which is very transparent on today’s system.

Ensure to check Add as Datastore option (default) will create the given name directly as a usable datastore. In our example this will be backup01.

Keep in mind, that this part is not needed when using a NFS share. Also do not use this in addition with hardware RAID controllers.

Adding User for Backup

In a next step, a dedicated user will be created that will be used for the datastore permissions and for the Proxmox VE instances for authentication and authorization. This allows even complex setups with different datastores, different users including different access levels (e.g., reading, writing, auditing,…) on different clusters and instances. To keep it simple for demonstrations, just a single user for everything will be used.

A new user is configured by selecting Configuration, Access Control and User Management in the left menu. There, a new user can be created by simply defining a name and a password. The default realm should stay on the default for the Proxmox Backup authentication provider. Depending on the complexity of the used name schema, you may also create reasonable users. In the given example, the user is called dc01cluster22backup01.

Adding Permission of User for Datastore

Mentioning already the possibility to create complex setups regarding authentication and authorization, the datastore must be linked to at least a single user that can access it. Therefore, we go back to the Datastore and select the previously created backup01 datastore. In the top menu bar, the permissions can be created and adjusted in the Permissions chapter. Initially, a new one will be created now. Within the following survey the datastore or path, the user and the role must be defined:

Path: /datastore/backup01
User: dc01cluster22backup01@pbs
Role: DatastoreAdmin
Propagate: True



To provide a short overview of the possible roles, this will be shortly mentioned without any further explanation:




Administration: Proxmox VE

The integration of the backup datastore will be performed from the Proxmox VE instances via the Datacenter. As a result, the Proxmox VE web frontend will now be used for further administrative actions. The Proxmox VE web frontend runs on tcp/8006, Therefore, all next tasks will be done on https://<IP-PROXMOX-VE-SERVER>:8006.

Adding Storage

Integrating the Proxmox Backup Server works the same way like managing and adding a shared storage to a Proxmox datacenter.

In the left menu we choose the active datacenter and select the Storage options. There, we can find all natively support storage options like (NFS, SMB/CIFS, iSCSI, ZFS, GlusterFS,…) of Proxmox and finally select the Proxmox Backup Server as a dedicated item.

Afterwards, the details for adding this datastore to the datacenter must be inserted. The following options need to be defined:

ID: backup22
Username: dc01cluster22backup01@pbs
Enable: True
Datastore: backup01


Optionally, also the Backup Retention and Encryption can be configured before adding the new backup datastore. While the backup retention can also be configured on the Proxmox Backup Server (which is recommended), enabling the encryption should be considered. Selecting an d activating the encryption is easily done by simply setting it to Auto-generate a client encryption key. Depending on your previous setup, also an already present key can be uploaded and used.

After adding this backup datastore to the datacenter, this can immediately be used for backup and the integration is finalized.


Proxmox provides with the Proxmox Backup Server an enterprise backup solution, for backing up Linux containers and virtual machines. Supporting features like incremental and fully deduplicated backups by using the benefits of different open-source solutions, in addition with strong encryption and data integrity this solution is a prove that open-source software can compete with closed-source enterprise software. Together with Proxmox VE, enterprise like virtualization environments can be created and managed without missing the typical enterprise feature set. Proxmox VE and the Proxmox Backup Server can also be used in addition to storage appliances from vendors like NetApp, by directly use iSCSI or NFS.

Providing this simple example, there are of course much more complex scenarios which can be created and also should be considered. We are happy to provide you more information and to assist you creating such setups. We also provide help for migrating from other products to Proxmox VE setups. Feel free to contact us at any time for more information.

Migrating VMs from VMware ESXi to Proxmox

In response to Broadcom’s recent alterations in VMware’s subscription model, an increasing number of enterprises are reevaluating their virtualization strategies. With heightened concerns over licensing costs and accessibility to features, businesses are turning towards open source solutions for greater flexibility and cost-effectiveness. Proxmox, in particular, has garnered significant attention as a viable alternative. Renowned for its robust feature set and open architecture, Proxmox offers a compelling platform for organizations seeking to mitigate the impact of proprietary licensing models while retaining comprehensive virtualization capabilities. This trend underscores a broader industry shift towards embracing open-source technologies as viable alternatives in the virtualization landscape. Just to mention, Proxmox is widely known as a viable alternative to VMware ESXi but there are also other options available, such as bhyve which we also covered in one of our blog posts.

Benefits of Opensource Solutions

In the dynamic landscape of modern business, the choice to adopt open source solutions for virtualization presents a strategic advantage for enterprises. With platforms like KVM, Xen and even LXC containers, organizations can capitalize on the absence of license fees, unlocking significant cost savings and redirecting resources towards innovation and growth. This financial flexibility empowers companies to make strategic investments in their IT infrastructure without the burden of proprietary licensing costs. Moreover, open source virtualization promotes collaboration and transparency, allowing businesses to tailor their environments to suit their unique needs and seamlessly integrate with existing systems. Through community-driven development and robust support networks, enterprises gain access to a wealth of expertise and resources, ensuring the reliability, security, and scalability of their virtualized infrastructure. Embracing open source virtualization not only delivers tangible financial benefits but also equips organizations with the agility and adaptability needed to thrive in an ever-evolving digital landscape.

Migrating a VM


To ensure a smooth migration process from VMware ESXi to Proxmox, several key steps must be taken. First, SSH access must be enabled on both the VMware ESXi host and the Proxmox host, allowing for remote management and administration. Additionally, it’s crucial to have access to both systems, facilitating the migration process. Furthermore, establishing SSH connectivity between VMware ESXi and Proxmox is essential for seamless communication between the two platforms. This ensures efficient data transfer and management during migration. Moreover, it’s imperative to configure the Proxmox system or cluster in a manner similar to the ESXi setup, especially concerning networking configurations. This includes ensuring compatibility with VLANs or VXLANs for more complex setups. Additionally, both systems should either run on local storage or have access to shared storage, such as NFS, to facilitate the transfer of virtual machine data. Lastly, before initiating the migration, it’s essential to verify that the Proxmox system has sufficient available space to accommodate the imported virtual machine, ensuring a successful transition without storage constraints.

Activate SSH on ESXi

The SSH server must be activated in order to copy the content from the ESXi system to the new location on the Proxmox server. The virtual machine will later be copied from the Proxmox server. Therefore, it is necessary that the Proxmox system can establish an SSH connection on tcp/22 to the ESXi system:

Find Source Information about VM on ESXi

One of the challenging matters in finding the location of the virtual machine holding the virtual machine disk. The path can be found within the web UI of the ESXi system:

Create a New Empty VM on Proxmox

Copy VM from ESXi to Proxmox

The content of the virtual machine (VM) will be transferred from the ESXi to the Proxmox system using the open source tool rsync for efficient synchronization and copying. Therefore, the following commands need to be executed from the Proxmox system, where we create a temporary directory to store the VM’s content:

mkdir /tmp/
cd /tmp/
rsync -avP* .

Depending on the file size of them virtual machine and the network connectivity this process may take some time.

Import VM in Proxmox

Afterwards, the disk is imported using the qm utility, defining the VM ID (which got created during the VM creation process), along with specifying the disk name (which has been copied over) and the destination data storage on the Proxmox system where the VM disk should be stored:

qm disk import 119 local-lvm

Depending on the creation format of the VM or the exporting format there may be multiple disk files which may also be suffixed by _flat. This procedure needs to be repeated by all available disks.

Starting the VM

In the final step, all settings, resources, definitions and customizations of the system should be thoroughly reviewed. One validated, the VM can be launched, ensuring that all components are correctly configured for operation within the Proxmox environment.


This article only covers one of many possible methods for migrations in simple, standalone setups. In more complex environments involving multiple host nodes and different storage systems like fibre channel or network storage, there are significant differences and additional considerations. Additionally, there may be specific requirements regarding availability and Service Level Agreements (SLAs) to be concern. This may be very specific for each environment. Feel free to contact us for personalized guidance on your specific migration needs at any time. We are also pleased to offer our support in related areas in open source such as virtualization (e.g., OpenStack, VirtualBox) and topics pertaining to cloud migrations.


On the 27th of March, Proxmox released their new import wizard (pve-esxi-import-tools) which makes migrations from VMware ESXi instances to a Proxmox environment much easier. Within an upcoming blog post we will provide more information about the new tooling and cases where this might be more useful but also covering the corner cases where the new import wizard cannot be used.