I have a client with several TB of backup requirements which I have been unable to find a solution for which I felt satisfied with. Originally they used NovaSTOR, which had many issues hiccuping on their backups, then I had them switch to Acronis which I have always favored due to the bare metal restores from an image, but it seems to be very unwieldy and the backup routines seem difficult to manage. Now that they have moved to a new server, they are faced with an $800 charge to continue to use Acronis, so I attempted to use Windows Server Backup on Windows Server 2008 R2, but after several errors I discovered it is incompatible with 4k formatted disks. Since the backups go to 3TB USB 3.0 external drives, it just doesn't work. Any thoughts on other solutions? I thought about using a smaller, 1 or 2TB disk with Windows Server Backup for the operating system and system state (2TB drive), then using Microsoft SyncToy or SyncBack to manage the file backups from their 9TB data array (3 sets of data, 3 different 3TB drives). All drives are switched and cycled to an offsite storage location on Wed. each week.