Recovery Manager for SharePoint Premier Edition
Migration Manager for Sharepoint
Server Administrator for SharePoint
Migration Suite for SharePoint
Migrator for SharePoint Online
You can see such error message when you try to copy your site using Site Administrator for SharePoint. Very often a reason for it can be that when exporting a specific site might also export objects outside this site as not only the objects in the site are exported but also dependent objects like images referenced in pages by this site and the master page assigned to the site. Actually you can exclude such dependencies from copping:
Jennifer LuPiba is a senior product marketing manager on the Dell Software Windows Management team, helping organizations embrace the cloud, deliver next-generation applications, reduce risk and increase efficiency and enable the modern work styles.