Recently we have upgraded a project from sitecore 6.5 to sitecore 8.0 update 5, and we are now in the process to go live, but we want to migrate the data from the live environment so we can deploy the upgraded site.
We always migrate the data by serializing the items in the content tree or creating sitecore packages. Is It safe to do this, specially we will move the items from sitecore 6.5 to 8, Any potential errors might happen? Are there another techniques we can use?