The QuickBooks source supports both Full Refresh and Incremental syncs. You can choose if this connector will copy only the new or updated data, or all rows in the tables and columns you set up for replication, every time a sync is run.
Important note: The refresh token expires every 100 days. You will need to manually revisit the Oauth playground to obtain a refresh token every 100 days, or your syncs will expire. We plan on offering full Oauth support soon so you don't need to redo this process manually.