Backing up CoreData store (sqlite) without indexes

I would like to backup my CoreData-generated sqlite database in a storage-efficient way, i.e., without the indexes.

I currently zip my user directory when creating a backup. However, this backs up the redundant indexes in the data base as well.

I've read the many posts on Stackoverflow about backing up CoreData and also Apple's documentation. For example: migratePersistentStore.

However, I haven't found a solution, yet.

So, can anyone explain a way to backup the sqlite database without the indexes on iOS?