If you are using Proxmox Virtual Environment Solution (PVE), then you may be taking VM backups to local storage, and you may also be using PVE Cluster for the High Availability of your critical VMs, all these services, provide redundancy, data retention, and data security but still, your data is always at risk of disasters such as fire, floods, storms, short-circuiting, storage failure, hardware theft, and hacking, etc, so to avoid such disasters, you may like to backup your critical VMs to a remote backup facility (Proxmox Backup Server PBS).
For an Off-site backup facility, you may choose a block in the next building or in another city but how about a cloud backup server? the caveat with this approach is that you need a high internet bandwidth up/down, low latency from the remote site, and also the VM size matters, the bigger the VM size the more bandwidth and time it takes for the first time upload to a remote facility and afterward, just the dirty bits(snapshot) of the data are transferred, and all of these factors also matter while restoring the VM backup.
So to start, just decide on an offsite location depending on your internet bandwidth and offsite infrastructure, and then install and configure proxmox backup server as mentioned in this guide: how-to-install-proxmox-offsite-backup-server-on-aws.
For this tutorial, I am following the above-mentioned guide for installing and configuring a Proxmox backup server on AWS EC2 Instance. If you are also choosing a cloud location then I will suggest choosing the nearest location, and specs as per the number of backup jobs, here is more information on specs.
Assuming that you are done with making an offsite backup server by following my recommended tutorial, let us now connect remote Proxmox Backup Server (PBS) to our Proxmox VE Server.
There are two methods for connecting the Remote Backup Server to your Local Proxmox VE Server.
- Add your remote backup server storage to Proxmox VE and then backup your VMs directly on this storage (Only for VMs which are in the Off State).
- Install a Local Proxmox Backup Server (PBS) as VM on Proxmox VE (PVE) and connect it to remote backup server (Best for all modes, especially for taking backups fo the VMs in the Running State ).
Add remote backup server storage to Proxmox VE
As mentioned in the Installation Tutorial, the Proxmox Backup Server uses Datastore to store VMs and Snapshots, so we can add this Datastore as storage in Proxmox VE.
This approach is fairly easy and simple but it has the following caveats.
- It is not recommened to backup your running VMs on the remote storage, as this will make them inaccessible during the time to first full VM backup and then on every incremental backup (snapshots) .
- This method should primarily be used for VMs that are in the stop or suspend state.
- This method can be used for running VMs only If the latency is about 5-25 ms from the remote location in combination with very high bandwidth.
So to start with method 1, log in to your Proxmox VE then select Server View –>Datacenter and then Select Storage–> Click Add–>and then Select Proxmox Backup Server as shown in the image.
Once you select Proxmox Backup Server then the following dialog box appears.
Now fill the form with the following entries:
ID: Type any name, this will appear as the storage name in the PVE left pane.
Server: Type the IP Address of your remote Proxmox Backup Server.
Username: In most cases, it is root@pam, or if you have changed your PBS username to something else then type in that.
Password: The remote PBS password for the user.
Datastore: The name for the remote PBS Datastore that you learned to create in the guide.
Nodes: If you are using a cluster then choose the desired nodes else let it be at default.
Fingerprint: Log in to your remote PBS web Interface then –> Click Dashboard–> from the right pane click Show Fingerprint–> then copy the Fingerprint and paste it here in the Fingerprint section –> then click Add.
Once done, then the storage name mentioned in the ID text field will be added to PVE.
Here is an example screenshot for you, it can be seen that the storage ID is vmbkp and Type is Proxmox Backup Server and thus remote storage is added to PVE.
After adding the remote storage to pve, let us take a backup of a small VM (100) to test our configuration.
Things to Know Before Taking Backup
- There are three modes of backup.
- There are two ways to take VM backup.
- Manual one-time backup
- The second is scheduled backup.
Here is a brief explanation for these modes: Snapshot offers backup while keeping the VM running, Suspend mode is also applicable on running VMs but it suspends or freezes the VM during the backup operation so that no data can be written to VM while the backup is in process. In the Stop mode, the VM is turned Off manually and then the backup process is started.
For manual backups, Select VM –> Backup –> Backup now, as shown.
So when you click the Backup now button then the following pop-up will be shown.
So choose your Storage to be the remote offsite PBS storage (mine is vmbkp), for Mode choose Stop and then click the Backup button.
Whenever you choose local storage for creating backups then PVE will always do Full Backup for the VM each time, but if you choose recently added remote storage for backups then the first backup will be a full VM backup and the next backups will be incremental which are also called snapshots and contain the dirty-bits or changed bits of data. It should also be noted that the snapshots or incremental backups shall only occur if the VM is in the running state.
This is also evident from the current backup screenshot, After the first full VM backup a second backup is taken while the VM is in an off state, It is also to be noted that the second backup is also a full backup, not an incremental backup and the reason is obvious, no data changes, hence nothing is written to remote storage (write 0 B/s).
when a backup is initiated for a VM in the running state then the first backup will be a full VM backup and the later backups are incremental backups. It is also to be noted that the first backup may take a long time depending on the remote latency, bandwidth, and VM size, the incremental backups will carry only the changed bits of data and will take less time to complete.
Scheduled Backups To Remote Proxmox Backup Server
The proxmox backup server also offers the functionality to schedule automatic periodic backups to the remote storage, the backup schedule can be break up into daily, weekly, monthly, or even yearly. To create a schedule we need to create a backup job, select–> Server View –> then select Datacenter –> then select Backup–> then click Add from the right pane as shown in the screenshot.
Once you click Add then the following pop-up will appear as in the screenshot.
Let’s say you would like to create a backup job that backs up VM 100 on daily basis and the backup job starts at 02:00 AM.
Here are the required settings for such a backup schedule as shown in the screenshot.
Here is a brief explanation of these settings.
Node: Select your local proxmox ve server from the drop-down list.
Storage: Do not select Local storage only select your Remote Proxmox Backup Storage.
Day of the Week: Select all days from the drop-down list.
StartTime: Choose your desired time such as 02:00 AM from the 24 hr format.
SelectionMode: leave at default & then select the desired VM from the list.
Send email to: Leave it blank for now, as you will need to configure SMTP, POP settings, which is not in the scope of the article.
Compression: It is greyed out and chooses by default ZSTD which is by far the best compression type.
Mode: You can choose the mode to be Stop or Suspend, that is up to you.
Enable: Make sure the Enable check box is selected, otherwise, the job schedule will not execute, on the other hand, you can always disable a backup job by unchecking the box.
After this click Create and your job will be created, furthermore you can start the job immediately by selecting the Run now button.
As shown in the screenshot the VM job has started and it is being backed up on the remote storage. As the VM is in the off state so there will be no incremental backups as no data is being written to the VM, in such a case a single backup every year will suffice but you may like to choose a different schedule.
The incremental backups shall take place only if the VM is turned on. You may test how the VM performs? in the on state while being backed up for the first time (Full VM Backup) and then on an incremental basis(snapshots) and performance is acceptable then stick to Method#1 for VMs in the running state else Method#2 is recommended to backup VMs in the running state.
Related Proxmox Backup Mentenance Tasks
Once you start to back up your VMs to the remote Proxmox Backup Server, then its time for backup maintenance tasks: