IDrive application is capable of backing up open files for supported platforms including Windows 2003 and 2008 servers, Windows 7 and Windows 8 is enabled by default.
Thus, even if your Microsoft Outlook application is open, the IDrive application does a reliable backup of associated data. Similarly, your Quickbooks / Quicken and other possible open files are backed up as well. Please select the associated .pst files to your backup set. Please ensure that volume shadow copy service is enabled and is started.