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For customers on file-based backup, common causes of errors include files locked by the operating system or in-use applications, large file sizes in excess 64GB, invalid permissions, or invalid system characters in file names.  If this is a common problem for you, it may be a sign that you should upgrade to our full-image backups powered by Veeam.  With full machine backups, most of these errors are eliminated as all backups are snapshot-based and fully integrated with Windows VSS (volume shadow copy service).  Contact our sales team at sales@esilo.com for information on how to upgrade.