I tried to backup site collection in SharePoint 2010 using by SharePoint 2010 Management Shell. Copy text below, and paste to SharePoint PowerShell Management :

Backup file does exist on drive C. Please find it on these location and check size of these file

I tried to restore site collection in SharePoint 2010 using by SharePoint 2010 Management Shell. First step, create a new web application. Make sure that site collection doesn’t exist there. Copy backup file to another location in your server. Copy text below, and paste to SharePoint PowerShell Management :

Restore-SPSite -Path E:\Backup\site_backup.bak

I tried to export site in SharePoint by using SharePoint 2010 Management Shell. Copy text below, and paste to SharePoint PowerShell Management.

Export-SPWeb http:/// -Path “site_export.cmp”

I tried to import site in SharePoint by using SharePoint 2010 Management Shell. First step, create a new site to import this file. Change template same as export site template. Copy text below, and paste to SharePoint PowerShell Management

Import-SPWeb http:/// –Path C:\Users\sharepoint\site_export.cmp

Note : Nintex workflow doesn’t include in the export file. Before that, you can backup workflow on these list or library. Click workflow on the ribbon menu,choose manage nintex workflow and select the workflow that you want to backup. On the ribbon menu of nintex workflo, choose export. It will be saved to the destination. After export file site, you can add it by import the workflow on the List or Library.