If you need to backup and restore a SharePoint site, PowerShell makes it easy. The following examples also show how to backup and old site and restore it to a new site.
Backup-SPSite -Identity “https://oldsite.com/sites/SharePointSite” -Path “D:\Backup\backup.bak”
Restoring to a new location:
Restore-SPSite -Identity “https://newsite.com/sites/NewSharePointSite” -Path “D:\Backup\backup.bak
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