I'm having a problem with my TC internet connection slowing down dramatically. When I connect my DSL modem directly to my Mini, it's fine. When I connect it to the TC there are big slow downs off and on. I'm wondering if the backups done by TM slow down the internet connection and the network as a whole.
Over ethernet no, it would have almost no effect.. over wireless yes.. it can have a big effect.
How big are the backups generally? These should only be incremental and relatively small.
Measure your actual speed of copying a file to the TC.. if you can put numbers to it, that will help. Use the Activity Monitor and see what is the average speed copying a file or when TM is backing up.
Any improvements to the wireless speed will reduce the time the backup runs and how much time your internet is slow. Wireless is highly range and signal dependent. You might find a network rearrangement where you use the TC close to the Mini can solve the issue.. especially if you can connect to it by ethernet.. and then wireless bridge if you need to.
That was only a suggestion for how to locate the TC closer to the Mini.. if you can do everything via ethernet.. then that is much better.. I have to say, I was assuming if ethernet was possible it is always chosen over wireless.. so I was assuming a rather large gap and ethernet wasn't possible.. always always use ethernet.. wireless is for portable devices... laptops and ipads etc.