mkdir C:\temp\Credentials

$cred1 = Get-Credential -Message "Enter credentials for Server1"
$cred1 | Export-Clixml -Path "C:\temp\Credentials\server1_cred.xml"

$cred2 = Get-Credential -Message "Enter credentials for Server2"
$cred2 | Export-Clixml -Path "C:\temp\Credentials\server2_cred.xml"

$cred3 = Get-Credential -Message "Enter credentials for Server3"
$cred3 | Export-Clixml -Path "C:\temp\Credentials\server3_cred.xml"

$destCred = Get-Credential -Message "Enter credentials for Destination Server"
$destCred | Export-Clixml -Path "C:\temp\Credentials\destination_cred.xml"