Using NetSuite Connector for Data Migration
NetSuite Connector isn't intended for mass data migration—it's meant for incremental syncing of data.
The NetSuite Connector order sync process allows up to 30 days of historical order data to be synced. Syncing more than 30 days' worth of historical data isn't supported. You should shorten that 30-day window if there are more than 2000 orders in that period. If you skip this step, it'll slow down your order sync and delay importing recent orders.Setting the order cutoff date controls how NetSuite Connector looks for historical data in a sync.
For more information about setting order cutoff dates in NetSuite Connector, see https://suiteanswers.custhelp.com/app/answers/detail/a_id/101662/loc/en_US
You should handle mass data migration through CSV import/export or other tools from NetSuite and your marketplace or cart.