Can I use it fully offline?
How do I back it up to USB drive?
What does the day-to-day operation of Pass compared to Keepass look like?
I am trying to learn it as I want to use it, as I think that keepass is bloated for my use case, and I would appreciate any help here.
This is not correct as pass uses GPG, and you can do symmetric encryption with it, it is just a different parameter in the command.
You can use a different password per file, or the same one
Citation needed,
manpage says nothing about that. Of course, you can use GPG directly to get symmetric, that is what I chose to do