You can export contact data on excel by clicking Bulk -> Export.
There are 2 option way to exporting data, Direct or Running in Background. If you choose Direct, apps will requesting export directly and will be downloaded by your browser automaticly after request has been finished.
On the other way Running in Background, you must see export status on Bulk -> Queue, if success then you can download the file, but this way more consistent on exporting many contacts, so there is advantage of each exporting method.