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    <p>The stack trace tells us a lot about what is happening. The most important line is Microsoft.SharePoint.SPFieldCollection.AddFieldToWeb This means that the error is occurring when a field, not a list is being added to an SPWeb. If you add to an SPFieldCollection with an existing name, this will error.</p> <p>You can use <a href="http://www.codeplex.com/spm" rel="nofollow noreferrer">SharePointManager</a> to have a peak at the site things are going into if you are curious.</p> <p>The reason this is happening is you are restoring to a sub site and the main site still has all the fields there.</p> <p>Your best bet is to make sure you have the latest patches etc (<a href="https://stackoverflow.com/questions/487571/using-stsadm-to-export-and-import-site-collection#488566">see Lars suggestion</a>).</p> <p><a href="https://stackoverflow.com/questions/487571/using-stsadm-to-export-and-import-site-collection#487903">Walm3864 post</a> is correct in that a new site collection will not have the same problem. A new site collection is usually a serious decision to make and has to be judged in light of your current information architecture.</p> <p>This will not affect search as the new site collection can be added to the existing url using a managed path (e.g. <a href="http://intranet/sites/" rel="nofollow noreferrer">http://intranet/sites/</a><em>mynewsiteyay</em>)</p> <p>It will impact on your backup strategy as you will need to add the new database to that process.</p> <p>It can be beneficial to add new site collections for some larger sub sites as it will improve the backup times if all databases are under 100GB. It is important to split out potentially large sites early as it is hard to do it after the fact.</p>
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