I recently received the following message while trying to restore a site collection backup:
“No content databases are available for this operation. Create a content database, and then try the operation again. To create a content database, click “Content databases” on the Application Management page, select the Web application to use, and then click “Add a content database”
The issue was that I had already restored the backup on the system and in the existing content database for the web application. Since the site collection doesn’t change GUIDs you can’t restore a site collection into two site collections in a web application that has only one content database – it has to be in a separate content DB. Add a new content DB and the error goes away.
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