I'm using a broadband connection with 5000 Kbit/s. Now I'm looking for a cheap backup connection. The cheapest solution (no monthly fee, only pay as you use) I found is 300 Kbit/s. Is this sufficient? In an emergency case I only need a connection to InteractiveBrokers (using TWS, Quotetracker and ZerolineTrader) to maintain my trading for some hours. Or should I get the 1000 Kbit/s line for which I pay a monthly fee?