I got this Email notification: Daily Backup Task is waiting for user interaction. Description: Create Differential Backup Archive From: C:\ To: L:\BACKUP\ Compression: Normal Exclude: Files matching mask Match criterion: *.bak, *.~, *.tmp, Problem Info: Failed to backup file or folder 'C:\Documents and Settings\BAYWATER\NTUSER.DAT'. Problem Details: Error opening the file. (0x40007) function = "CreateFileW", filename = "\\?\C:\Documents and Settings\BAYWATER\NTUSER.DAT" Tag = 0xA8A1022BD18AE037 The process cannot access the file because it is being used by another process (0xFFF0) code = 80070020 Tag = 0xBD28FDBD64EDB8A6 I'm guessing your quick answer would be to make sure the user is logged off, however is there any other way around this? I'm using this on the latest XP Pro with all updates applied, and am using the latest version of Acronis. I'm backing up from SATA XP Software Mirrored drives, to a USB Western Digital My Book.