Move sub-site to another site collection

Question

We have a SharePoint 2013 on premise environment.

I need to move some sub sites (spweb's) and their content, including the unique permissions, over to another site collection.

I have not found suitable powershell or GUI commands I can apply for my purpose. Is this possible with powershell or SharePoint GUI? Or do I have to use a 3rd party tool? Please advice.

If you know about any good tools I can use then please let me know.

Answer 1

As you have the unique Permission then I think best option is use the 3rd party tools i.e Sharegate( as they offer free trial).

There are limitation with export & import web commands.Even you use Includesecurity in your paramters then unique permission on list will not carry.I would try the following steps and test what moved and what's not.

1. export the subsite using the Export-SPWeb http://site -Path "site export.cmp"
2. Create a subsite on the destination without template New-SPWeb http://somesite/subweb1
3. Now run the Import-SPWeb http://site -Path export.cmp -IncludeUserSecurity -Overwrite