Skip to main content


Druva Documentation

System requirements

Phoenix Editions: File:/tick.png Business File:/cross.png Enterprise File:/tick.png Elite

This topic contains the following sections:

Ensure that you read through all the requirements mentioned in this topic before you set up Phoenix to back up your databases. 

Defining support levels

Druva categorizes its platform support levels as follows:

  • Certified Platforms:
    A certified platform is fully tested by Quality Assurance (QA) team. Druva certifies these environments and performs regular testing with every cloud release to ensure the functionality works as expected.
  • Supported Platforms:
    A supported platform is not tested by the Druva QA team with every cloud release, however, the functionality should work as expected. Druva will provide support for such platforms. Issues that require time and resources beyond commercial viability may not be addressed.

Certified platforms

Windows Server (64-bit)

(Standard and Enterprise editions)

SQL server editions

Windows Server 2016 (x86-64)

  • SQL Server 2016 SP1 
  • SQL Server 2014

Microsoft Windows Server 2012 R2

  • SQL Server 2016 SP1
  • SQL Server 2014
  • SQL Server 2012 Service Pack (SP) 2
  • SQL Server 2008 Service Pack (SP) 4
  • SQL Server 2008 R2 SP 3

Microsoft Windows Server 2012 

  • SQL Server 2016 SP1
  • SQL Server 2012 SP 2
  • SQL Server 2008 R2 SP 3
  • SQL Server 2008 RTM

Microsoft Windows Server 2008 R2 SP 1

  • SQL Server 2012 SP 2
  • SQL Server 2008 RTM

Microsoft Windows Server 2008 R2

  • SQL Server 2008 R2 SP 3
  • SQL Server 2008 RTM

Microsoft Windows Server 2008 SP 2

  • SQL Server 2012 SP 2
  • SQL Server 2008 R2 SP 3
  • SQL Server 2008 RTM

Microsoft Windows Server 2008

  • SQL Server 2008 SP 4
  • SQL Server 2008 RTM


  • Phoenix agent interacts with Volume Shadow Copy Service (VSS) to back up your data. To ensure successful backups from your servers, make sure that the Volume Shadow Copy Service is running. 
  • Druva recommends that you use the Microsoft’s native VSS provider. If you are using a third-party VSS provider, you must configure Phoenix agents to recognize this provider. 
  • Ensure that the SQL Writer Service on your MS-SQL servers is running. 
  • Ensure that the disk space on the drive where your shadow copy storage is located is adequate for the cumulative size of your databases. To know how you can configure VSS to write shadow copies to a separate drive, see Set VSS to write shadow copies to a separate NTFS volume
  • Ensure that you enabled Windows authentication for your SQL servers. For more information, see Change Server Authentication Mode.  
  • Ensure that the Local System account has permissions listed in the following table:
    Permission Description
    Bulkadmin Required during transaction mark restore with numerous inline transactions when pushed through VDI connection.
    Dbcreator Required during the point in time standby restore to create and access the .tmp file required during the process.
    Diskadmin Required during the point in time standby restore to create and access the .tmp file required during the process.
    Processadmin Required during full and differential restores that are performed using SQL writer and log restore using VDI connection.
    Securityadmin Required to access database for restore from the Phoenix process for the point in time and standby restore.
    Serveradmin Required to access database for restore from the Phoenix process for the point in time and standby restore.
    Setupadmin  Required for backup and restore operations.
    Sysadmin Required during restore to execute the TSQL query in parallel to VDI connection.
  • If you are running an agent with version 4.6.5 or earlier, set the SQLCMD system variable path to reflect the path to the SQLCMD utility directory. If this variable is not set correctly, backups and restores to and from your MS-SQL server will fail. 
  • If you want to perform log backups for the database, ensure that you set the databases to FULL RECOVERY mode. For more information about modifying recovery mode, refer to View or Change the Recovery Model of a Database.  

Key considerations

Following list provides information on MS-SQL and Windows features that Phoenix supports and uses to backup and restore databases.

  • Phoenix supports backup of MDF, NDF, and LDF files. 
  • Phoenix only supports databases created on NTFS volumes. 
  • Phoenix supports file-stream database backup. 
  • Phoenix does not support backup of encrypted or mirrored SQL server databases. Ensure that you exclude such databases from backups.  
  • Phoenix does not support backups of databases having an apostrophe or a comma in their names. Ensure that you exclude such databases from backups.  
  • Phoenix supports transaction log truncation. Transaction logs are truncated after Phoenix backs them up. 
  • Log backups are retained based on daily retention policy. If a log backup falls out of daily retention period, it is deleted. Weekly, monthly, and yearly retention policies are not applicable for log backups.  
  • Log backups for single user database fail, if it is the only database that is getting backed up. If a single-user database is not the only database, the log backup job is successfully completed with errors. 
  • For MS-SQL agent version 4.6.5 or earlier, backups of MDF, NDF, and LDF files that reside at the root of a drive are not supported. For example, if your MDF files reside in D:\, a backup of these files will fail. That is why you must ensure that the MDF, NDF, and LDF files reside in a subfolder under a drive, for example, D:\ThisFolder.  

Limitations of MS-SQL servers

The following list provides information on scenarios when a backup or restore job can fail.

  • If recovery model of the database is changed from FULL to SIMPLE after last successful log backup, the next log backup is skipped.
  • If a third-party tool takes log backup after Phoenix application latest log backup, the log backup fails until the next full/differential successful backup is triggered.
  • If log backup was triggered and the same database was replaced by a restore method by any application or a user, then the log backup fails until the next full backup job is complete.
  • If for any database provided, point-in-time restore is not available (transaction log not backed up due to any reason), then the database is restored to the nearest available restore point.
  • The agent is tested to back up a maximum of 64 databases.
  • Encrypted databases are not supported.
  • Databases which get mirrored are not supported.
  • Other VSS-based backup software may cause agent’s VSS snapshot mechanism to fail.
  • It is possible that due to third-party backup solutions, MS-SQL server backup may fail. The product is not exhaustively tested with all other backup solutions.
  • If a third-party VSS provider is used, the product may not work. It is recommended to use the default Microsoft provider.
  • Database name with apostrophe and comma is not supported.
  • Due to Windows limitations, a restore job can fail if restore path exceeds 260 characters. 
  • Single-user database log backups are skipped.
  • Not all database attributes are restored. For example, Read-only attribute, Restricted access, Ownership, and Broker-Enabled.
  • Restore to MS-SQL server instance fails if you try to restore to a folder/directory having folder compress property enabled.
  • A single-user database should not be backed up if it is being used by any user, this may result in backup failure.
  • Restore may fail if MS-SQL instance contains any database/databases with the state 'restoring'. Remove all databases having the state 'restoring' from MS-SQL instance to restore successfully.
  • Restore cannot be performed for databases with the same name across instances in single restore request.
  • Point-in-time restore across time zones is not supported.
  • Restore across MS-SQL server versions is not supported, and may fail due to compatibility issues.
  • If the same database name is selected for restore from multiple instances, the restore fails.
  • If the network is disabled during log backup or restore, the log backup/restore will fail. This is not a typical network disconnect scenario.
  • Database standby restore from MS-SQL 2012 to MS-SQL 2014 fails with ‘database upgrade needed’.
  • Database restore from MS-SQL 2014 to MS-SQL 2012 fails with VSS writer error.

Next steps

Read Quick steps to set up Phoenix to back up databases to get started.