First backup to TC failed halfway through after 24 hours plus of transfer

Dear all
To say that I'm frustrated right now with TM/TC would be an understatement. Here's my situation:
1 I have 270G of data on my iMac
2 my transfer speed to TC is only 130 Gbit/s, less than half speed
3 the TC is about 4m from my iMac, no walls between, same room
4 I have a AXg connected via bridge (for AirTunes) - I did this in an attempt to keep the network at n speeds, but this seems not to be the case
5 the transfer was slow but steady (see #2 above) - after 26 or 27 hours it had reached the halfway point - it will take two and a half days to make the first backup
6 then it failed, and started the backup from scratch again!
What do I do now? If I start the whole process again, it could easily fail again after another day of transfer...
Well, this can't be normal: only half-speed transfer rates, facing a 60-hour transfer that fails halfway through? What do people do with even more data than I have?
I erased the partial backup via Airport Utility, and seek help in avoiding a repeat of this mess.
Questions:
1 do other processes cause a backup to fail? (eg if my computer is being used, or is synching, or whatever) - it is totally impossible for me to suspend use of my iMac for 60 hours while the initial backup takes place.
2 can I make the initial backup via Ethernet cable?
3 does the fact that I have VM Fusion installed affect the backup?
4 how can I get a better transfer speed (somewhere nearer the max of 300 Mbit/sec?)
I would be very grateful indeed for advice and help - watching the backup creep along for more than a day only for it fail and then be back at square one is mind-numbing.

I searched my system logs and found a file that caused my connection to the TC to fail. I erased that file (after checking what it was - a temporary file connected to my Epson scanner) and tried again to back up for the first time.
This time it worked, and in under 10 hours (I had been expecting about 20-24 hours, based on the data transfer speed).
I'm very relieved - let's hope that TC and TM will now function.

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