Remove the backup from the list
Plug in the external device that has the backup or remove the backup from the list. Or change the drive letter of external disk back to the original one
Make sure the external device (e.g. USB disk) is plugged in and working
Make sure the external device is accessible
This is a GUI issue. The backup will still run successfully
The specified file cannot be found
Readd the backup and recreate the backup settings to fix the issue
Known issue with Nonstop backup browser in Acronis True Image's window. Use one of the methods described below to retrieve the needed file(s) from the Nonstop backup.
The issue will be fixed in one of the future versions of the software.