Wait, if you're wanting to rip your originals onto an HDD for backup, just load up a USB loader (I recommend Wiiflow and/or Configruable USB Loader), and there will be an option to install it to HDD, which will then rip the game that's in the disc drive into your HDD for backup. It'll save you the process of having to use another HBC program to rip it, and then going to a USB loader to play it.
yup. you can use gx to rip it to a wbfs formatted hdd. i'm not sure about ripping to fat 32 with gx. i still use wbfs so i haven't tried to rip to fat 32. riping to wbfs will only give you the game partition. if you want a full 1:1 copy use cleanrip. if you just want to load up your hdd and don;t care about a clean dump go with gx.
Absolutely. I'm not sure about the FAT32 support about USB Loader GX, but it's a stable loader, and will rip any game to a WBFS-formatted HDD for sure. I started out with USB Loader GX and used it until I discovered Configurable USB Loader, and then WiiFlow. The latter have large amounts of features and customisability, but USB Loader GX is an exceptional loader at getting the job done.