Depends on your bandwidth requirements. Also, if you want even higher reliability, you might consider getting two independent internet links into your basement, which is pretty doable in an urban setting.
For a long time, my off-site backup was at my grandmother's house because it was the furthest geographic location I could give someone a box who would leave it plugged into their Internet. ;)
And you also need to have diverse routing for power coming in and generator / battery room set up.