The number of rows replicated from source to destination are counted as ingestion rows. If incremental ingestion is selected, then only changed/new rows are counted as ingestion rows.
A data source is a connection to your data source endpoint. For example if you have 2 MySQL clusters, 1 GA account, 1 FB account; then in this case there are 4 datasources.
Sprinkle supports 100+ datasources and all the popular data warehouses. Check the list of integrations for more information. If you do not find the integration you are looking for, you can write to us, we will make it available.