How to determine if a SQL Server backup is compressed?

Compressed SQL Server backups can be verified in PowerShell using a handy PowerShell function. This comes in handy when you need to verify if existing SQL Server backups are compressed.

The following PowerShell function returns 1 when a SQL Server backup is compressed. You need to provide the (remote) database server and backup file location.



$SMOServer = New-Object Microsoft.SqlServer.Management.Smo.Server $Server
$Res = New-Object Microsoft.SqlServer.Management.Smo.Restore

$Res.Devices.AddDevice($BAKFile, [Microsoft.SqlServer.Management.Smo.DeviceType]::File)

$Res.ReadBackupHeader($SMOServer).Rows[0].CompressedCode language: PowerShell (powershell)

Provide server hostname ($Server) and backup file ($BackFile), usage:

PS C:\Users\janreilink> .\Desktop\IsBackupCompressed.ps1 localhost D:\mssql\backups\testdb.bak
1Code language: PowerShell (powershell)

Source: JNK on Database Administrators StackExchange. There is also an Stored Procedure available by Max Vernon to determine if a database backup file is initialized for compression.

Jan Reilink

Hi, my name is Jan. I am not a hacker, coder, developer or guru. I am merely an application manager / systems administrator, doing my daily thing at Embrace - The Human Cloud. In the past I worked for clidn and Vevida. With over 20 years of experience, my specialties include Windows Server, IIS, Linux (CentOS, Debian), security, PHP, websites & optimization. I blog at