I mean that you should keep record of everything required by the regs. My understanding is that if you receive dual, a CFI signature should be included. In addition to that, certain types of flying require an endorsement. You need to keep these signatures and endorsements somewhere. All that means is that it should be recorded somewhere....anywhere. Copies are nice, but not necessary.

You should carry NOTHING with you if you are at least a PVT. The FAA does not require you to carry it, so why give a fed the chance to go through your logbook during a ramp check? Just because you are flying a tailwheel, does not mean the regs require a tailwheel endorsement to be carried with you. It just requires that you receive one. If its in a ziplock in your freezer or in a safety deposit box in another state, doesn't matter. If the feds or an employer want to see your logbooks, you have time to prove your training, it does not have to be on the spot.