XP Laptop using 1.4.11

Setup the URbackup server and a bunch of win 10 machines all working ok with multiple drives backing up. Have one laptop on XP with client 1.4.11 has one HDD with a partition with MSDos C: and Win XP on E: the client backups up E: when checking server it creates a file for C: but only 1K and says MBR but none of the data. The Image settings are set to ‘ALL’ for drives to backup, any ideas why its not backing up contents of the C: partition?