If you have large amounts of data you want to backup online, you might want to consider using external hard drives instead if you have Comcast. Not sure about Comcast in your area, but around here they just implemented a monthly cap of 250GB on data transfers. So backing up 400GB of images online wouldn't even be possible here. And if they haven't implemented it in your area yet, chances are it's coming.
I've not gotten any notices, I'll have to look into my service agreement. I don't recall any caps ever being placed on my bandwidth. That's not to say they haven't changed something.
In your area, what happens when you go over 250GB? Do they charge you by the GB or do they just shut your service off?
I initially heard about this not from Comcast, but in an article on El Reg a couple weeks ago.
Comcast trials bandwidth cap meter ⢠The Register
According to the article if you go over the limit:
Under current policy, Comcast phones customers after they exceed the cap, and if they exceed it again within six months, their accounts are subject to termination.
The article also mentions:
This morning, the US cable giant
announced a pilot launch of the web-based meter in Portland, Oregon, saying it would reach the rest of the country "after a short period."
I received an email this morning, explaining that the bandwidth meter for our area is up and running (the El Reg article mentioned it, but I checked two weeks ago and it wasn't available here yet, only in Portland), which is what prompted me to comment in this thread.
Apparently they announced the cap last year (I think the article says Oct. 2008), but I don't recall getting an email or anything. Usually they email that kind of stuff.
EDIT: I found the Comcast Acceptable Use Policy, talk about the cap a bit:
https://customer.comcast.com/Pages/HelpNFC.aspx?print=false&id=aup-lite
EDIT 2: Keep in mind the cap is for residential customers. I don't know about the business customers.