Pose...
I play a 3K and use the USB thumbdrive...but suspect you would be well advised to save everything on the HD. If the T2 is similar to the 3K in respect to the User Drive, storage on User Drive will be limited.

As to figuring out the best way to set up your reg files, there are several "best" ways depending on who you talk to. I prefer assigning an entire bank to one song (although I hardly ever use all 8 regs within the bank).

I divided the alphabet by 10 and created a folder for each portion of the alphabet, saving each song I have created a registration for, by name, in the respective folder.

What I like about the way I do it is each registration I create can be customized from here to heaven and back as well as accessed very quickly on a job.

Others here utilize the Music Finder Directory in combination with registrations. There's a ton of ways to do it.

Eddie