The common question we have is how to export new data not data we already exported.
This is the process you need to follow.
1) Select number of rows you want to export for example 5K
2) Add those rows to some list (this can take some time, observe "Number of records" count to see if operation adding rows to the list is done.
3) Now export those rows to CSV file
4) To your existing filters add additional filter to exclude previously created list.
This will filter all data from the database based on your filters but exclude data you already exported that is contained in list you created.
5) Now you select next 5000 records, add to same list, then repeat the process.