dbatools

1.1.29

functions/Remove-DbaBackup.ps1

                                function Remove-DbaBackup {

    <#

    .SYNOPSIS

        Removes SQL Server backups from disk.

    .DESCRIPTION

        Removes SQL Server backups from disk.

        Provides all of the same functionality for removing SQL backups from disk as a standard maintenance plan would.

        As an addition you have the ability to check the Archive bit on files before deletion. This will allow you to ensure backups have been archived to your archive location before removal.

        Also included is the ability to remove empty folders as part of this cleanup activity.

    .PARAMETER Path

        Specifies the name of the base level folder to search for backup files. Deletion of backup files will be recursive from this location.

    .PARAMETER BackupFileExtension

        Specifies the filename extension of the backup files you wish to remove (typically 'bak', 'trn' or 'log'). Do not include the period.

    .PARAMETER RetentionPeriod

        Specifies the retention period for backup files. Correct format is ##U.

        ## is the retention value and must be an integer value

        U signifies the units where the valid units are:

        h = hours

        d = days

        w = weeks

        m = months

        Formatting Examples:

        '48h' = 48 hours

        '7d' = 7 days

        '4w' = 4 weeks

        '1m' = 1 month

    .PARAMETER CheckArchiveBit

        If this switch is enabled, the filesystem Archive bit is checked before deletion. If this bit is set (which translates to "it has not been backed up to another location yet", the file won't be deleted.

    .PARAMETER RemoveEmptyBackupFolder

        If this switch is enabled, empty folders will be removed after the cleanup process is complete.

    .PARAMETER EnableException

        By default, when something goes wrong we try to catch it, interpret it and give you a friendly warning message.

        This avoids overwhelming you with "sea of red" exceptions, but is inconvenient because it basically disables advanced scripting.

        Using this switch turns this "nice by default" feature off and enables you to catch exceptions with your own try/catch.

    .PARAMETER WhatIf

        If this switch is enabled, no actions are performed but informational messages will be displayed that explain what would happen if the command were to run.

    .PARAMETER Confirm

        If this switch is enabled, you will be prompted for confirmation before executing any operations that change state.i

    .NOTES

        Tags: Storage, DisasterRecovery, Backup

        Author: Chris Sommer (@cjsommer), www.cjsommer.com

        Website: https://dbatools.io

        Copyright: (c) 2018 by dbatools, licensed under MIT

        License: MIT https://opensource.org/licenses/MIT

    .LINK

        https://dbatools.io/Remove-DbaBackup

    .EXAMPLE

        PS C:\> Remove-DbaBackup -Path 'C:\MSSQL\SQL Backup\' -BackupFileExtension trn -RetentionPeriod 48h

        '*.trn' files in 'C:\MSSQL\SQL Backup\' and all subdirectories that are more than 48 hours old will be removed.

    .EXAMPLE

        PS C:\> Remove-DbaBackup -Path 'C:\MSSQL\SQL Backup\' -BackupFileExtension trn -RetentionPeriod 48h -WhatIf

        Same as example #1, but doesn't actually remove any files. The function will instead show you what would be done.

        This is useful when first experimenting with using the function.

    .EXAMPLE

        PS C:\> Remove-DbaBackup -Path 'C:\MSSQL\Backup\' -BackupFileExtension bak -RetentionPeriod 7d -CheckArchiveBit

        '*.bak' files in 'C:\MSSQL\Backup\' and all subdirectories that are more than 7 days old will be removed, but only if the files have been backed up to another location as verified by checking the Archive bit.

    .EXAMPLE

        PS C:\> Remove-DbaBackup -Path 'C:\MSSQL\Backup\' -BackupFileExtension bak -RetentionPeriod 1w -RemoveEmptyBackupFolder

        '*.bak' files in 'C:\MSSQL\Backup\' and all subdirectories that are more than 1 week old will be removed. Any folders left empty will be removed as well.

#>

    [CmdletBinding(SupportsShouldProcess)]

    param (

        [parameter(Mandatory, HelpMessage = "Full path to the root level backup folder (ex. 'C:\SQL\Backups'")]

        [Alias("BackupFolder")]

        [string]$Path,

        [parameter(Mandatory, HelpMessage = "Backup File extension to remove (ex. bak, trn, dif)")]

        [string]$BackupFileExtension ,

        [parameter(Mandatory, HelpMessage = "Backup retention period. (ex. 24h, 7d, 4w, 6m)")]

        [string]$RetentionPeriod ,

        [switch]$CheckArchiveBit = $false ,

        [switch]$RemoveEmptyBackupFolder = $false,

        [switch]$EnableException

    )

    begin {

        # Ensure BackupFileExtension does not begin with a .

        if ($BackupFileExtension -match "^[.]") {

            Write-Message -Level Warning -Message "Parameter -BackupFileExtension begins with a period '$BackupFileExtension'. A period is automatically prepended to -BackupFileExtension and need not be passed in."

        }

    }

    process {

        # Process stuff

        Write-Message -Message "Removing backups from $Path" -Level Verbose

        Find-DbaBackup -Path $Path -BackupFileExtension $BackupFileExtension -RetentionPeriod $RetentionPeriod -CheckArchiveBit:$CheckArchiveBit -EnableException |

            ForEach-Object {

                $file = $_

                if ($PSCmdlet.ShouldProcess($file.Directory.FullName, "Removing backup file $($file.Name)")) {

                    try {

                        $file | Remove-Item -Force -EA Stop

                    } catch {

                        Write-Message -Message "Failed to remove $file." -Level Warning -ErrorRecord $_

                    }

                }

            }

        Write-Message -Message "File Cleaning ended." -Level Verbose

        # Cleanup empty backup folders.

        if ($RemoveEmptyBackupFolder) {

            Write-Message -Message "Removing empty folders." -Level Verbose

            (Get-ChildItem -Directory -Path $Path -Recurse -ErrorAction SilentlyContinue -ErrorVariable EnumErrors).FullName |

                Sort-Object -Descending |

                ForEach-Object {

                    $OrigPath = $_

                    try {

                        $Contents = @(Get-ChildItem -Force $OrigPath -ErrorAction Stop)

                    } catch {

                        Write-Message -Message "Can't enumerate $OrigPath." -Level Warning -ErrorRecord $_

                    }

                    if ($Contents.Count -eq 0) {

                        return $_

                    }

                } |

                ForEach-Object {

                    $FolderPath = $_

                    if ($PSCmdlet.ShouldProcess($Path, "Removing empty folder .$($FolderPath.Replace($Path, ''))")) {

                        try {

                            $FolderPath | Remove-Item -ErrorAction Stop

                        } catch {

                            Write-Message -Message "Failed to remove $FolderPath." -Level Warning -ErrorRecord $_

                        }

                    }

                }

            if ($EnumErrors) {

                Write-Message "Errors encountered enumerating folders." -Level Warning -ErrorRecord $EnumErrors

            }

            Write-Message -Message "Removed empty folders." -Level Verbose

        }

    }

}

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