FSCK is mostly a thing of the past. Smarter backup tools can do instantaneous snapshots with deduplication and more. "dd" is the WORST way to read or write a hard drive, whatever you might be trying to accomplish. And hard drive throughput does keep getting faster as capacities increase, so it's not as big of a hit as you might expect.
If you've got a 6TB drive packed with a few large files (like Blu-ray or HDTV rips) and they don't completely change from day to day, a simple rsync over the network could still be extremely fast.
If you've got a 6TB drive packed with a few large files (like Blu-ray or HDTV rips) and they don't completely change from day to day, a simple rsync over the network could still be extremely fast.