Questions on running a Sia host!

[Cole Green]

So I'm building some junk to run a Sia host. The parts basically include:
A five or so year old PC (Don't have yet)
4 1TB WD Blue drives in a software Raid 5
Ubuntu 16.04 LTS
A wifi card
Maybe a UPS if I can

But I have some questions!

1. How do I connect a wallet I already have to host with? I viewed the hosting guide on the forum last night and it only went over creating a new wallet. I'm sure it's possible to use an existing wallet, right?

2. Is there any minimum bandwidth for this? I only have about 4Mbps available for upstream and about 30Mbps for downstream. There is now a speed limiter within the Sia program... I hope?

3. If my computer's power supply, motherboard, boot drive, or any other critical part went out and I had a spare computer to throw the drives with the Sia data into, would this be a viable solution to getting back online quickly?