A few newbie questions (Dash is attracting attention...):

1) To run a masternode, besides having 1k dash in a wallet, do I need a computer working 24/7? What happens if there is a downtime (let's say I run out of power, my ISP is down, or whatever...)? Do I lose rewards for that month?

2) If I run a masternode on my computer with 2k dash, do I get twice the reward? Or do I need to have 2 wallets and 2 computers to earn twice what I could earn with 1k dash in a masternode? Or one wallet with 2 computers?

I hope the answer helps other people interested.

Thanks!