The main reason to use COPS is to make your calibre library available in a situation where you cannot leave calibre's builtin server running, either because it is a NAS or because of the lower dependencies of COPS.
If you want to upload books to calibre's library, calibre includes an auto-add-from-watched-folder feature which may come in useful, also the currently-underway content server rewrite (for calibre v3.0) is supposed to have read-write capabilities.
There is no schedule for when it may be done, but it might be your (long-term) solution.
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