External drive is formatted with fat32...tsk tsk.
NTFS is so much better, but you know that now!
If the supplier of your PC made your disks Dynamic I think you should go round and frighten them, it's a mean stunt to pull with zero benefit on a home system.
On a corporate network server it is a real boon being able to slam another disk into a spare slot on an external enclosure, and then add it to an over subscribed array in windows.
But on a workstation, or home PC, when you don't have the luxury of 'slipping in' an extra drive...
Sorry M8, Backup is and always has been an 'also ran' but it will do the job in it's own quirky way.
Over a network it can be suicide inducing though, I once backed up a load of stuff, and 'cos I was bored I frigged around with my network settings.
Caused the network adapter to reset and lost the entire backup, completely evaporated..