The next problem i have got when i tried to replace the backup from a SharePoint Site.
The problem i'v got is "Restore-SPSite : The site collection could not be restored." what you can see in my powershell dump below.
The problem is that in the contentdatabase on the url a site is registered.
You read allot of person the describe to restore a database backup to fix this problem. This is not necessary.
There is a easier way.