Backup List in Sharepoint 2010 in Shell - list

Question

I want to backup a List of Sharepoint 2010 using the powershell.
I can backup the list using the central Administration and can also backup the whole Site using
Export-SPWeb -Identity http://siteurl:22222/en-us -Path \\public\backup.cmp
But when I try to export a specific List (with the path that is also shown using the Central Administration):
Export-SPWeb -Identity http://siteurl:22222/en-us/Lists/MyList -Path \\public\backup.cmp
I receive the error:
"The URL provided is invalid. Only valid URLs
that are site collections or sites are allowed to be exported using
stsadm.exe"
I also tried
Export-SPWeb -Identity http://siteurl:22222/en-us -Path \\public\backup.cmp -ItemURL http://siteurl:22222/en-us/Lists/MyList
getting the same error
Thanks in advance

Answer 1

Try to fiddle with the ItemUrl parameter value:
Export-SPWeb -Identity http://siteurl:22222/en-us -Path \\public\backup.cmp
-ItemUrl /Lists/MyList
or
Export-SPWeb -Identity http://siteurl:22222/en-us -Path \\public\backup.cmp
-ItemUrl /en-us/Lists/MyList
or
Export-SPWeb -Identity http://siteurl:22222/en-us -Path \\public\backup.cmp
-ItemUrl "/Lists/MyList"
Different sources show different syntax:
SharePoint 2010 Granular Backup-Restore Part 1
Failing to export with Export-SPWeb

Answer 2

If you have the following kind of setup:
Site Collection e.g. http://localhost:81
|
|-> Subsite 1 e.g. tools (http://localhost:81/tools)
|
|-> Subsite 2 e.g. admin (http://localhost:81/tools/admin)
I found the following worked for lists on the subsite:
Export-SPWeb -Identity http://<site>:<port>/<subsite1>/<subsite2> -ItemUrl /<subsite1>/<subsite2>/<listName> -Path <localpath>/<filename>.cmp -IncludeVersions All
e.g.
Export-SPWeb -Identity http://localhost:81/tools/admin/ -ItemUrl /tools/admin/RequestList -Path C:/Temp/Backup.cmp -IncludeVersions All
To ensure you've got the right url for your list, use the following command (thanks to HAZET here: http://social.technet.microsoft.com/Forums/en-US/sharepoint2010setup/thread/a1f48e70-9360-440f-b160-525fbf2b8412/):
$(Get-SPWeb -identity http://<site>:<port>/<subsite1>/<subsite2>).lists | ft title, #{Name="itemURL"; Expression = { $_.parentWebURL + "/" + $_.RootFolder}}
e.g.
$(Get-SPWeb -identity http://localhost:81/tools/admin/).lists | ft title, #{Name="itemURL"; Expression = { $_.parentWebURL + "/" + $_.RootFolder}}
Some examples of various errors I encountered whilst trying to get this to work:
The URL provided is invalid
Export-SPWeb : <nativehr>0x80070057</nativehr><nativestack></nativestack> At line:1 char:13
CategoryInfo : InvalidData: (Microsoft.Share...CmdletExportWeb: SPCmdletExportWeb) [Export-SPWeb], SPException FullyQualifiedErrorId : Microsoft.SharePoint.PowerShell.SPCmdletExportWeb
Some things to check:
Check that -Identity has the trailing slash i.e. http://localhost:81/
Check that you have the complete URL in Identity (if using subsites, include subsites)
Check that the path where you're trying to store your export file exists
Check that your ItemUrl is correct (i.e. starts with / and is a directory, not a specific file e.g. is /tools/admin/RequestsList, not /tools/admin/RequestsList/AllItems.aspx
Check that you have permissions to perform the export
Further info that might be helpful:
Identity: The URL of your SharePoint site
ItemUrl: The relative URL of your list/document library
Path: The target filename and location for the exported list e.g. C:/Temp/backup.cmp
IncludeVersion: What versions of the document you wish to export.
Export-SPWeb
http://technet.microsoft.com/en-us/library/ff607895.aspx
Export a site, list or document library in SharePoint 2010
http://technet.microsoft.com/en-us/library/ee428301.aspx
Import a list or document library in SharePoint 2010
http://technet.microsoft.com/en-us/library/ee428322.aspx