I am about to start redirecting 3 domains into 1, exact filename by filename, and it occurred to me that I don't actually know the answer to a simple question:
Do I leave the original files on the original server/domain, or do I erase them? Presumably they won't count as duplicates, since spiders shouldn't see them if I do the 301 correctly... but does it make any difference?
Basically, what to do with the old domain after the 301 is setup? Do I have to keep it alive in perpetuity?