|Well actually, there are ways to aggregate the bandwidth as well as have redundancy but you won't get that with SOHO level equipment.|
While I'm sure there is enterprise level equipment out there capable of aggregating bandwidth and providing redundancy we don't use that here at my work so I don't know any makes/models offhand.
We're using teamed, multihomed linux based servers to do aggregation/redundancy.
I just quickly googled "aggregate bandwidth and provide redundancy with one device" and found the following:
There were a couple other links too.
We use teamed redundant servers so we can lose one device but still have both links available. With a single device, should the entire device fail (ie: PSU fails) then you're still going to lose connectivity but if you buy two devices and configure both identically, downtime can be reduced to minutes in a single point of failure setup.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.