Apologies if I'm being dense. I have a new mac and transferred everything over from my old mac as instructed. Since then the old laptop just been stuck in a drawer. I keep meaning to wipe it and take it back to factory settings in order to sell it on but I have an irrational fear that wiping the old laptop will wipe everything even from the new laptop as well because in my head they're both the same account. Please someone tell me it's okay to just go ahead and I'll still have everything. I've also still got 4 old iPhones that are still waiting to be wiped because of the same fears!