Error "No mapping between account names and security IDs was done" during Backup Exec System Recovery 2010 installation
1 - Go to Control Panel and open "Folder Options".
2 - Select the View tab.
3 - Scroll all the way down and de-select "Use Simple File Sharing (recommended)" in Windows 2003 or "Use Sharing Wizard (Recommended)" in Windows 2008.
4 - Set the Folder properties/security tab for the folder which needs to be backed up to 'Full Control' for the SYSTEM account.