Barracuda can back up open and locked files because the Windows Volume Shadow Service is used to copy the files to a temporary location, as they are encrypted and sent to the Barracuda servers. For instance, if you choose to back up your Outlook.pst file, and you have Outlook open when the backup runs, Barracuda can back up that file properly.
Note: You can configure ECHOplatform to back up files across a network to another server or computer. However, VSS does not allow the ECHOplatform agent to back up open and locked files across the network.