Check if your company has a second internet provider, as many companies do provide that important back-up. Even though NetSuite contractually commits to a 99.5% uptime (and has historically maintained 99.8%!), that doesn’t help you if your own internet provider decides to take a vacation.
You also have options – you can keep entering using Excel, and push what you’ve entered into NetSuite once you reconnect. And you can use the mobile version temporarily while your internet provider is busy getting service restored.