Sounds like ya did it the "right way"
Yes, keeping some info "in the office" is a "has-to-be" for some companies. But, they pay the freight when someone else has to do that work again.
I use duplicate copies, and keep what I deem "for my eyes only" off of the field copies.
Good planning never hurts. Once, with a posted "ahead" schedule, one guy was "sick" on a tough push day....but, it only happened once, and he was shocked when the job was a day behind!
You have to do what you think is best for your situation.