Copy-DbaBackupDevice.ps1

function Copy-DbaBackupDevice {
    <#
    .SYNOPSIS
        Copies backup devices one by one. Copies both SQL code and the backup file itself.

    .DESCRIPTION
        Backups are migrated using Admin shares. If the destination directory does not exist, SQL Server's default backup directory will be used.

        If a backup device with same name exists on destination, it will not be dropped and recreated unless -Force is used.

    .PARAMETER Source
        Source SQL Server. You must have sysadmin access and server version must be SQL Server version 2000 or higher.

    .PARAMETER SourceSqlCredential
        Login to the target instance using alternative credentials. Accepts PowerShell credentials (Get-Credential).

        Windows Authentication, SQL Server Authentication, Active Directory - Password, and Active Directory - Integrated are all supported.

        For MFA support, please use Connect-DbaInstance.

    .PARAMETER Destination
        Destination SQL Server. You must have sysadmin access and the server must be SQL Server 2000 or higher.

    .PARAMETER DestinationSqlCredential
        Login to the target instance using alternative credentials. Accepts PowerShell credentials (Get-Credential).

        Windows Authentication, SQL Server Authentication, Active Directory - Password, and Active Directory - Integrated are all supported.

        For MFA support, please use Connect-DbaInstance.

    .PARAMETER BackupDevice
        BackupDevice to be copied. Auto-populated list of devices. If not provided all BackupDevice(s) will be copied.

    .PARAMETER Force
        If this switch is enabled, backup device(s) will be dropped and recreated if they already exists on destination.

    .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.

    .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.

    .NOTES
        Tags: Migration, Backup
        Author: Chrissy LeMaire (@cl), netnerds.net

        Website: https://dbatools.io
        Copyright: (c) 2018 by dbatools, licensed under MIT
        License: MIT https://opensource.org/licenses/MIT

        Requires: sysadmin access on SQL Servers

    .LINK
        https://dbatools.io/Copy-DbaBackupDevice

    .EXAMPLE
        PS C:\> Copy-DbaBackupDevice -Source sqlserver2014a -Destination sqlcluster

        Copies all server backup devices from sqlserver2014a to sqlcluster using Windows credentials. If backup devices with the same name exist on sqlcluster, they will be skipped.

    .EXAMPLE
        PS C:\> Copy-DbaBackupDevice -Source sqlserver2014a -Destination sqlcluster -BackupDevice backup01 -SourceSqlCredential $cred -Force

        Copies only the backup device named backup01 from sqlserver2014a to sqlcluster using SQL credentials for sqlserver2014a    and Windows credentials for sqlcluster. If a backup device with the same name exists on sqlcluster, it will be dropped and recreated because -Force was used.

    .EXAMPLE
        PS C:\> Copy-DbaBackupDevice -Source sqlserver2014a -Destination sqlcluster -WhatIf -Force

        Shows what would happen if the command were executed using force.

    #>
    [CmdletBinding(DefaultParameterSetName = "Default", SupportsShouldProcess, ConfirmImpact = "Medium")]
    param (
        [parameter(Mandatory)]
        [DbaInstanceParameter]$Source,
        [PSCredential]$SourceSqlCredential,
        [parameter(Mandatory)]
        [DbaInstanceParameter[]]$Destination,
        [PSCredential]$DestinationSqlCredential,
        [object[]]$BackupDevice,
        [switch]$Force,
        [switch]$EnableException
    )
    begin {
        if (-not $script:isWindows) {
            Stop-Function -Message "Copy-DbaBackupDevice does not support Linux yet though it looks doable"
            return
        }
        try {
            $sourceServer = Connect-DbaInstance -SqlInstance $Source -SqlCredential $SourceSqlCredential
        } catch {
            Stop-Function -Message "Failure" -Category ConnectionError -ErrorRecord $_ -Target $Source
            return
        }
        $serverBackupDevices = $sourceServer.BackupDevices
        $sourceNetBios = $Source.ComputerName

        if ($Force) { $ConfirmPreference = 'none' }
    }
    process {
        if (Test-FunctionInterrupt) { return }
        foreach ($destinstance in $Destination) {
            try {
                $destServer = Connect-DbaInstance -SqlInstance $destinstance -SqlCredential $DestinationSqlCredential
            } catch {
                Stop-Function -Message "Failure" -Category ConnectionError -ErrorRecord $_ -Target $destinstance -Continue
            }
            $destBackupDevices = $destServer.BackupDevices
            $destNetBios = $destinstance.ComputerName

            foreach ($currentBackupDevice in $serverBackupDevices) {
                $deviceName = $currentBackupDevice.Name

                $copyBackupDeviceStatus = [PSCustomObject]@{
                    SourceServer      = $sourceServer.Name
                    DestinationServer = $destServer.Name
                    Name              = $deviceName
                    Type              = "Backup Device"
                    Status            = $null
                    Notes             = $null
                    DateTime          = [Dataplat.Dbatools.Utility.DbaDateTime](Get-Date)
                }

                if ($BackupDevice -and $BackupDevice -notcontains $deviceName) {
                    continue
                }

                if ($destBackupDevices.Name -contains $deviceName) {
                    if ($force -eq $false) {
                        if ($Pscmdlet.ShouldProcess($destinstance, "Backup device $deviceName exists at destination. Use -Force to drop and migrate.")) {
                            $copyBackupDeviceStatus.Status = "Skipped"
                            $copyBackupDeviceStatus.Notes = "Already exists on destination"
                            $copyBackupDeviceStatus | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject
                            Write-Message -Level Verbose -Message "Backup device $deviceName exists at destination. Use -Force to drop and migrate."
                        }
                        continue
                    } else {
                        if ($Pscmdlet.ShouldProcess($destinstance, "Dropping backup device $deviceName")) {
                            try {
                                Write-Message -Level Verbose -Message "Dropping backup device $deviceName"
                                $destServer.BackupDevices[$deviceName].Drop()
                            } catch {
                                $copyBackupDeviceStatus.Status = "Failed"
                                $copyBackupDeviceStatus | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject
                                Write-Message -Level Verbose -Message "Issue dropping backup device $deviceName on $destinstance | $PSItem"
                                continue
                            }
                        }
                    }
                }

                if ($Pscmdlet.ShouldProcess($destinstance, "Generating SQL code for $deviceName")) {
                    Write-Message -Level Verbose -Message "Scripting out SQL for $deviceName"
                    try {
                        $sql = $currentBackupDevice.Script() | Out-String
                        $sql = $sql -replace [Regex]::Escape("'$source'"), "'$destinstance'"
                    } catch {
                        $copyBackupDeviceStatus.Status = "Failed"
                        $copyBackupDeviceStatus | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject
                        Write-Message -Level Verbose -Message "Issue scripting out backup device $deviceName on $destinstance | $PSItem"
                        continue
                    }
                }

                Write-Message -Level Verbose -Message "Preparing to copy actual backup file"

                $path = Split-Path $sourceServer.BackupDevices[$deviceName].PhysicalLocation
                $destPath = Join-AdminUnc $destNetBios $path
                $sourcepath = Join-AdminUnc $sourceNetBios $sourceServer.BackupDevices[$deviceName].PhysicalLocation

                Write-Message -Level Verbose -Message "Checking if directory $destPath exists"

                if ($(Test-DbaPath -SqlInstance $destServer -Path $path) -eq $false) {
                    $backupDirectory = $destServer.BackupDirectory
                    $destPath = Join-AdminUnc $destNetBios $backupDirectory

                    if ($Pscmdlet.ShouldProcess($destinstance, "Updating create code to use new path")) {
                        Write-Message -Level Verbose -Message "$path doesn't exist on $destinstance"
                        Write-Message -Level Verbose -Message "Using default backup directory $backupDirectory"

                        try {
                            Write-Message -Level Verbose -Message "Updating $deviceName to use $backupDirectory"
                            $sql = $sql -replace [Regex]::Escape($path), $backupDirectory
                        } catch {
                            $copyBackupDeviceStatus.Status = "Failed"
                            $copyBackupDeviceStatus | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject
                            Write-Message -Level Verbose -Message "Issue updating script of backup device $deviceName with new path on $destinstance | $PSItem"
                            continue
                        }
                    }
                }

                if ($Pscmdlet.ShouldProcess($destinstance, "Copying $sourcepath to $destPath using BITSTransfer")) {
                    try {
                        Start-BitsTransfer -Source $sourcepath -Destination $destPath -ErrorAction Stop
                        Write-Message -Level Verbose -Message "Backup device $deviceName successfully copied"
                    } catch {
                        $copyBackupDeviceStatus.Status = "Failed"
                        $copyBackupDeviceStatus | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject
                        Write-Message -Level Verbose -Message "Issue copying $sourcepath to $destPath for backup device $deviceName on $destinstance | $PSItem"
                        continue
                    }
                }

                if ($Pscmdlet.ShouldProcess($destinstance, "Adding backup device $deviceName")) {
                    Write-Message -Level Verbose -Message "Adding backup device $deviceName on $destinstance"
                    try {
                        $destServer.Query($sql)
                        $destServer.BackupDevices.Refresh()

                        $copyBackupDeviceStatus.Status = "Successful"
                        $copyBackupDeviceStatus | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject
                    } catch {
                        $copyBackupDeviceStatus.Status = "Failed"
                        $copyBackupDeviceStatus | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject
                        Write-Message -Level Verbose -Message "Issue creating backup device $deviceName on $destinstance | $PSItem"
                        continue
                    }
                }
            }
        }
    }
}