1. When you run the browser exploit it will boot automatically to emunand. In order to see the Gateway menu hold the L trigger when you see the white/grey screen. From here you can back up sysnand etc. ((hopefully you have done that already, in not Do It Now!)
2. Gateway menu does not backup emunand. Use emunand tool to back up it up and then copy the contents of the mSD card to PC.
3. If you enter system settings or there is a crash/freeze you will need to run the browser exploit again. Yes, leaving it charged will keep you in emunand but there can be crashes fro sleep mode for long periods of time (reportedly). Leaving the gateway card in the system during sleep drains the battery faster.
4. If you have an Android there is a method to set up a off line server to run the exploit, maybe even a jailbroken iPhone.
5. Leaving wifi on in sleep mode will download an update for emunand or sysnand. Turn wifi off. Warning ATT free wifi and Nintendo zones will download an update even if you do not have internet connections setup. You must diasable wireless to prevent this.
6. To play original cartridges you boot into "classic" mode from the gateway menu. It is dangerous to play them from sysnand because they contain updates and potentiality can update your sysnand. The problem is updates do not apply to classic mode. Solutions are being worked on but it is best to play games with updates as Rome from emunand for now.
Good to hear it is working out for you now.