When you insert a record (entity), you can specify which fields are indexed. This is done on a row by row basis. So in your table you can have a few rows, some are indexed, some not. The unindexed rows take a lot less space. The downside is that you can only get them by primary key. So minimize the indexes to the bare minimum you need in the copy. Also look at the indexes on your master data, you may not need all of them.
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