
I'm currently backing up 3 internal HD's, and 1 external USB drive (H:) and using another external drive (G:) as the back up destination.
The first back up take a long time as expected and does exactly what I wanted. My issue is on the subsequent iterative back up, it seems to make a full back up of the H: drive every time which is taking hours (7+ hours). All the other drives do the iterative backup as expected and only take a few minute to back up the data which has changed but it seems to want to copy over the entire contents of the external one every time.
I've tried not including external drives and each iterative back ups takes minutes to complete.
Is there any way to make it only update the changes on the H: external drive?
The only issue why I can think why it may be doing this is that is the only drive which is FAT formatted not NTFS. I do need this drive to be FAT for compatibility between Mac and PC. If this is the issue would making the drive XFAT help at all?
Thanks,
John