Copy file remotely with PowerShell - powershell

Question

I am writing a PowerShell script that I want to run from Server A.
I want to connect to Server B and copy a file to Server A as a backup.
If that can't be done then I would like to connect to Server B from Server A and copy a file to another directory in Server B.
I see the Copy-Item command, but I don't see how to give it a computer name.
I would have thought I could do something like
Copy-Item -ComputerName ServerB -Path C:\Programs\temp\test.txt -Destination (not sure how it would know to use ServerB or ServerA)
How can I do this?

Answer 1

From PowerShell version 5 onwards (included in Windows Server 2016, downloadable as part of WMF 5 for earlier versions), this is possible with remoting. The benefit of this is that it works even if, for whatever reason, you can't access shares.
For this to work, the local session where copying is initiated must have PowerShell 5 or higher installed. The remote session does not need to have PowerShell 5 installed -- it works with PowerShell versions as low as 2, and Windows Server versions as low as 2008 R2.[1]
From server A, create a session to server B:
$b = New-PSSession B
And then, still from A:
Copy-Item -FromSession $b C:\Programs\temp\test.txt -Destination C:\Programs\temp\test.txt
Copying items to B is done with -ToSession. Note that local paths are used in both cases; you have to keep track of what server you're on.
[1]: when copying from or to a remote server that only has PowerShell 2, beware of this bug in PowerShell 5.1, which at the time of writing means recursive file copying doesn't work with -ToSession, an apparently copying doesn't work at all with -FromSession.

Answer 2

Simply use the administrative shares to copy files between systems.
It's much easier this way.
Copy-Item -Path \\serverb\c$\programs\temp\test.txt -Destination \\servera\c$\programs\temp\test.txt;
By using UNC paths instead of local filesystem paths, you help to
ensure that your script is executable from any client system with
access to those UNC paths. If you use local filesystem paths, then you
are cornering yourself into running the script on a specific computer.

Answer 3

Use net use or New-PSDrive to create a new drive:
New-PsDrive: create a new PsDrive only visible in PowerShell environment:
New-PSDrive -Name Y -PSProvider filesystem -Root \\ServerName\Share
Copy-Item BigFile Y:\BigFileCopy
Net use: create a new drive visible in all parts of the OS.
Net use y: \\ServerName\Share
Copy-Item BigFile Y:\BigFileCopy

Answer 4

Just in case that the remote file needs your credential to get accessed, you can generate a System.Net.WebClient object using cmdlet New-Object to "Copy File Remotely", like so
$Source = "\\192.168.x.x\somefile.txt"
$Dest = "C:\Users\user\somefile.txt"
$Username = "username"
$Password = "password"
$WebClient = New-Object System.Net.WebClient
$WebClient.Credentials = New-Object System.Net.NetworkCredential($Username, $Password)
$WebClient.DownloadFile($Source, $Dest)
Or if you need to upload a file, you can use UploadFile:
$Dest = "\\192.168.x.x\somefile.txt"
$Source = "C:\Users\user\somefile.txt"
$WebClient.UploadFile($Dest, $Source)

Answer 5

None of the above answers worked for me. I kept getting this error:
Copy-Item : Access is denied
+ CategoryInfo : PermissionDenied: (\\192.168.1.100\Shared\test.txt:String) [Copy-Item], UnauthorizedAccessException>
+ FullyQualifiedErrorId : ItemExistsUnauthorizedAccessError,Microsoft.PowerShell.Commands.CopyItemCommand
So this did it for me:
netsh advfirewall firewall set rule group="File and Printer Sharing" new enable=yes
Then from my host my machine in the Run box I just did this:
\\{IP address of nanoserver}\C$