Since the first days of the adoption of an Information System by companies, backing up the workloads was crucial and a production blocker : No production without backup, no backup, no business.
Today, companies are better mastering and understanding their backup needs, solutions and they are continually seeking for better, simple and cost effective backup software.
One of the ‘headache’ subjects that bother the majority of the backup admins and decision makers is the Remote Offices / Branch Offices (ROBO) ‘Files and Folders’ data backup.
During this post, I will show why Azure Backup via the MARS agent is your best choice to get rid of the ROBO workloads backup problematic. I will present :
- Use cases for using Azure Backup via MARS agent
- What do you need to know in order to be comfortable with this solution
- What are the steps to plan and start using Azure Backup via MARS agent for your ROBO
1- Use cases for using Azure Backup via MARS agent
Azure Backup is the name of a complete enterprise backup solution allowing several backup scenarios and using the last technologies, specially the ability to back up to the cloud and to benefit from a GFS model (a model allowing efficient Long term retention policies).
What is interesting about Azure Backup via MARS agent is that it allows you to backup your files and folders without the need to deploy a Backup Infrastructure or a Storage infrastructure. This opens up a lot of use cases :
Backup without backup infrastructure
The following picture shows the end to end data journey from your Windows Server or Workstation to the cloud storage (More details about the components later on this post). As you can note, the backup will needs only the installation of the Azure Backup Agent (MARS agent : Microsoft Azure Recovery Services agent) and to configure it to
backup data to a cloud location (Recovery Services Vault)
This is fantastic since it removes the classic requirements to enable workloads backup :
- Backup software infrastructure (Backup server, Backup Proxy…)
- Local storage : No need for a SAN or a NAS. Azure backup will directly send data to the cloud using an internet connection
Short and Long term retention without backup infrastructure
In addition to the great value from the first discussed statement, Azure Backup provides in the same time, Short and Long term retention within the same policies. No need for tapes, no need for external provider to handle it. Azure Backup use a GFS model to allow Long Term retentions without any additional configuration. You can reach up to 99 years of retention period for up to 9999 recovery points (These values can change on the future).
Low bandwidth/Latency ROBO locations
The Azure Backup agent supports throttling (2) the data transfer to the cloud location (Not for all OSs). This is very important for ROBO location with limited bandwidth that prevent you from using your central backup infrastructure (Backup to a central backup repository)
2- What do you need to know
In this section, I will resume the important information that you need to know about the Azure Backup (Specially with the MARS agent). These information will give you the ability to decide, design and implement Azure backup into your information system.
Fortunately, the Azure Backup pricing is very simple. It’s well explicated on the official documentation (1) but to resume:
When you backup a workload, you pay for :
- An Azure Backup fixed cost for each backed up instance (The cost depends on the size of the data being backed up)
- The storage used by the recovery points:
- You can choose between LRS or GRS storage (3). To resume, LRS (Locally redundant storage) is a storage only available with the region where you create the Recovery Vault. GRS is a storage replicated asynchronously to another paired region providing hence, a protection against region failure, but more expensive (4) (~ * 2)
- The redundancy cannot be changed after the first workload backup, so be sure of your decision before going forward
For example, if you backup 4 windows servers, you will pay:
- 4* Azure Backup fixed cost
- The cost of the Azure storage (cloud storage) used by the recovery points
In this section, I will resume what do you need to technically be ready to use Azure Backup (via the MARS agent)
2.2.1- Azure Level
As discussed earlier in this post, you need the location where you will send and store backups. This is called Recovery Services Vault (RSV). An RSV is a Microsoft Azure resource, which means that you need to subscribe to Azure in order to deploy it. Subscribing to Microsoft Azure is very simple, there are many ways to achieve it, depending on your needs and the billing/relation model that you want. In order to use Azure, you need to create an Azure subscription (5). After creating it, you can directly without any requirement create an Azure Recovery Vault, ready to host your backups (within minutes).
You will then need access* to the Recovery Vault in order to begin. You can benefit from the Azure RBAC roles (6) in order to have or give required permissions.
In order to backup Files and Folders via the MARS agent, you will just need:
- The MARS agent installation file : Allowing you to install the agent on the required servers
- The Vault credentials : Allowing the MARS agent to find and authenticate to the Azure Recovery Vault.
Both of them can be downloaded via the Azure portal via the Azure Recovery Services resource blades.
* Technically, you don’t need access to the Recovery Vault to enable backups. An Admin can send you the required information instead.
2.2.2- Local level
I mean by local level, what do you need at the server level (The server where the folders and files to be backed up) in order to start backing up :
- A supported Operating system : Only Windows is supported, Linux is not yet supported.
- A internet connectivity : The agent needs outbound internet connection to the Azure services in order to send data. Using a Proxy is supported. You can in addition limit the outbound flows to only Azure services public IPs (7) (And even more, only the IPs belonging to the RSV region)
There are limitations regarding the supported operating systems, what can you backup, how often you can backup and more. Please refer to the Azure Backup FAQ for complete information
2.3- Security and data confidentiality
Azure backup via the MARS agent provides many precious security aspects, let me enumerate some of them:
- You will need a Vault credentials file in order to register an agent to a vault. Only backup admins can download such file from the Azure portal
- Before enabling the backup, you will be prompted to provide a ‘passphrase’. A passphrase is a ‘complex password’ used to encrypt data before sending it to the RSV. Data is encrypted and send via HTTPS to the RSV where it remains encrypted. Note that without this passphrase, you will not be able to restore data in case you lose the original server (Or its configuration), the passphrase must be kept securely somewhere (You can use Azure Key Vault to store your secrets)
- In case your server is compromised, the compromiser (Hacker, malicious admin) cannot delete you recovery points. Azure backup provides a security setting (enabled by default) that requires the ‘remover’ to login to the Azure Portal and generate a PIN code. The probability that the ‘compromiser’ owns the credentials to login to the Azure portal is small. In addition, you can benefit from the ‘MFA’ feature of Azure portal in order to more secure the portal access.
- In case of ransomware/crypto-locker attack or infection, your backup data is protected, since the backup media is totally independent of the server.
- Other security prevention feature are also available (8) :
- Retention of deleted backup data: Backup data retained for 14 days after delete operation
- Minimum retention range checks: Ensures more than one recovery point in case of attacks
- Alerts and notifications: For critical operations like Stop backup with delete data
- Multiple layers of security: Security PIN required for critical operations (Already mentioned)
2.4- Monitoring and reporting
Like you noticed, there is no server nor a console to install, monitor or see what is happening. All is done via the Azure Portal. You can use the Azure portal to :
- Backup Items : View the backed up items (Server name, volume…)
- Backup Status : You can view and show the status of the backups, with ‘filtering’ options
- Backup jobs: You can see the backup jobs and their status. You can see the duration and the size of the backups and restore operations
- Notifications : You can configure and see the notifications related to the jobs. Currently, you can only configure notifications based on the jobs status (Critical, Warning, Information)
Currently, there is no ‘Reporting’ feature with Azure backup via the portal. But this feature is coming very soon.
3- How to start : The plan
In this third and final section, I will present the planning steps in order to successfully plan and implement your ‘Folders and Files’ backup. The main steps are :
- Create a Recovery Services Vault
- Configure the vault
- Download the Recovery Vault credentials
- Install the MARS Agent on the server
- Create a backup policy and a schedule
This link shows the detailed steps to achieve the above steps : https://docs.microsoft.com/en-us/azure/backup/backup-configure-vault
The Azure Backup FAQ contains the most answers to your questions :
To finish, the following are my recommendations when planning to implement Azure Backup via the MARS agent:
Question / Constraint
|Are my source servers located on the same region ?||It’s recommended to backup data to the nearest location in order to benefit from a better performance / Latency during backup and restore operations.|
|Do I need to back up to the same RSV ?||No, but to have a simple design, it’s better to minimize the number of RSV for the a similar servers group.|
|When do I need to backup to different RSV||What can differentiate two Recovery Services Vault :
– The redundancy of the Storage (LRS or GRS)
– The user rights on the RSV
– The vault credentials
– If you have different ‘data’ importance, and you want to optimize the costs, you can create ‘LRS’ RSVs for less important data, and ‘GRS’ RSVs for more important and critical data
– You can give permissions to access or manage the Recovery Service Vault. If you want different security levels for your Vault, you can create multiple RSV
– The Vault Credentials are unique for an RSV. A user with a valid Vault credentials file (expires after 2 days) can backup data to the vault
|Use the same passphrase for each server ?||No. This is absolutely not recommended for the unique reason is that someone compromises the passphrase, he can access you all your server’s restore points (He will need a valid Vault credentials file)|
(1) Azure Backup pricing : https://azure.microsoft.com/en-us/pricing/details/backup/
(2) Azure Backup agent network throttling : https://docs.microsoft.com/en-us/azure/backup/backup-configure-vault
(3) Azure Storage redundancy : https://docs.microsoft.com/en-us/azure/storage/storage-redundancy
(4) Azure Storage pricing : https://azure.microsoft.com/en-us/pricing/details/storage/blobs-general/
(5) Designing Azure Subscriptions : https://buildwindows.wordpress.com/2016/03/30/azure-iaas-arm-architecting-and-design-series-azure-subscriptions/
(7) Azure Public IP ranges : https://www.microsoft.com/en-us/download/details.aspx?id=41653
(8) Azure-backup-security-feature : https://azure.microsoft.com/en-us/blog/azure-backup-security-feature/
(9) Azure subscription and service limits, quotas, and constraints : https://docs.microsoft.com/en-us/azure/azure-subscription-service-limits