Clarify:
RAM is Memory
Disk is Storage
Calibre ALWAYS makes a copy of the File, which is why I suggested off loading (archive?) the original SOURCE FILE
Kovid (the creator) point out that during the ADD, there exist a (3rd) temporary copy that goes away when the ADD session posts to the DB. This is the reason for doing in small batches if you are drive space limited.
Calibre can use any LOCAL attached drive (no cloud or Shares).
Calibre can manage any quantity of Libraries. The only limit is the number that appears on the Quick Switch list. They still exist
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