Moscool

Strangely enough, LR does remember it! I rename on import but then again when LR is shown the same memory card with the first batch of photos still on it, it somehow recognises them...

It depends what you use: I work with Super Duper to keep my HDs in synch, so no need to create a separate backup. At the same time I won't erase a card until I'm sure both HD versions are stable