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What are the requirements to estimate cost for backup SQL servers in VM?

Priyadarshini 60 Reputation points
2026-04-21T05:42:42.99+00:00

What are the requirements to estimate cost for backup SQL servers in VM?

Azure Backup
Azure Backup

An Azure backup service that provides built-in management at scale.

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  1. Suchitra Suregaunkar 13,785 Reputation points Microsoft External Staff Moderator
    2026-04-21T09:24:47.5066667+00:00

    Hello Priyadarshini

    Thank you for reaching out. Below are the key requirements and inputs needed to estimate the cost of backing up SQL Servers running in Azure VMs using Azure Backup.

    To generate an accurate cost estimate, you'll need the following details:

    1. SQL Server Size and Count You need to know the total size of the SQL databases you plan to protect and the number of SQL server instances with that size.

    2. Backup Data Compression Azure Backup typically achieves around 80% compression when SQL compression is enabled — meaning backup data is roughly 20% of the original SQL server data size. If your environment behaves differently, you can specify a custom compression ratio in the estimator.

    3. Log Backup Size You should estimate the daily log backup size as a percentage (%) of your SQL server data size.

    4. Daily Data Churn This refers to the expected daily data change rate on the SQL servers. Most databases tend to have high churn, but if you know the exact percentage, you can enter a custom value.

    5. Backup Policy Configuration You'll need to decide on:

    • Backup type: The recommended approach is daily differentials with weekly/monthly/yearly full backups, which is more storage-efficient and supports single-click restore. Alternatively, you can opt for daily/weekly/monthly/yearly full backups only.
    • Retention periods: Define how long to retain log backups (7–35 days), daily, weekly, monthly, and yearly backups based on your compliance and business needs.

    6. Backup Storage Redundancy Choose the storage redundancy for your backup vault:

    • GRS (Geo-Redundant Storage) — recommended for high availability and compliance, as it replicates data to a secondary region.
    • LRS (Locally Redundant Storage) — suitable for dev/test scenarios or where geo-redundancy is not required.

    How Billing Works: Azure Backup for SQL Server in Azure VMs is billed based on the size of backed-up data (before compression and encryption):

    • Instance ≤ 500 GB → fixed price + storage consumed
    • Instance > 500 GB → charged per 500 GB increment + storage consumed

    You can also download the Azure Backup Pricing Estimator (Excel worksheet) from Microsoft to get detailed month-wise and year-wise cost projections.

    For more details, please refer to the official documentation: Estimate costs for Azure Backup – Microsoft Learn

    I hope this helps clarify the requirements. Please let us know if you have any further questions.

    Thanks,
    Suchitra.

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  1. Q&A Assist
    2026-04-21T05:42:53.7066667+00:00
    AI generated content. This question contains an answer created with AI from Q&A Assist. Learn more

    To estimate the cost for backing up SQL Servers running in Azure VMs with Azure Backup, the following inputs are required:

    1. SQL Server size and count
      • Size of each SQL Server VM (data to be protected).
      • Number of SQL Server VMs with that size.
    2. Backup data compression expectation
      • Expected compression ratio for SQL backup data.
      • Typical case: around 80% compression when SQL compression is enabled (backup data size ≈ 20% of SQL server data size), or specify a different expected compression if known.
    3. Log backup characteristics
      • Expected size of log backups, expressed as daily log size as a percentage of the SQL Server size.
    4. Daily data churn
      • Expected daily data change rate (churn) on the SQL Servers.
      • Typically High churn for databases, or provide a specific churn percentage if known.
    5. Backup policy configuration
      • Backup type:
        • Recommended: Daily differentials with weekly/monthly/yearly full backups (more storage-efficient), or
        • Policy with daily/weekly/monthly/yearly full backups only (uses slightly more storage).
      • Retention settings:
        • Log backups retention (in days, 7–35).
        • Daily backup retention (in days).
        • Weekly backup retention (in weeks).
        • Monthly backup retention (in months).
        • Yearly backup retention (in years).
    6. Backup storage redundancy (optional)
      • Storage redundancy for backup data:
        • GRS (Geo-redundant storage) for highest availability and compliance.
        • LRS (Locally redundant storage) for dev/test or where enterprise-level redundancy is not required.
    7. Regional pricing / discounts (optional)
      • Whether to estimate using different regional prices or discounted rates.
      • If yes, provide the alternative regional or discounted price inputs.

    These parameters allow calculation of both Azure Backup service charges and backup storage consumption for SQL Servers in Azure VMs.

    References:

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