MBL Second Time Backups

well, it all depends how you do your backups, full vs incremental.

If you second backup is full, yes, it will take the same amount of time, or longer if size has increased.

Now, the backup is only as fast as your network. The slowest link for your setup, assuming you are 100/1000 wired, would be wireless. Now, even if you have AC or N, does not mean you write at those speeds. Lots of factors involve, nevertheless, as stated before, it is all on the LAN.

Do a backup wired, see how fast it is.

Also, there are hardware limitations, see this link:

http://www.tomshardware.com/reviews/gigabit-ethernet-bandwidth,2321-3.html

And last, not ideal but it will work, if you do the backups from external (USB I assume) to MBL. All traffic will go thru your PC.

USB drive → PC → MBL

I would just do: PC → MBL