How to export contact list that includes total contributions to date?
If you add the Summary Fields extension then you can choose to have a field for 'total amount', total this financial year, count this financial year, etc etc, which then makes exporting much easier as it is 'just' another custom field

https://civicrm.org/extensions/summary-fields
https://civicrm.org/extensions/joinerys-more-summary-fields
https://civicrm.org/extensions/synopsis