That being said, do keep in mind that, luggage allowance is just 10 kg. So if you're a windsurfer or a kite-boarder on a tight budget and you're bringing your equipment to Anambas, then the ferry may be a better choice. Still, excess luggage fee is pretty paltry, so all told, the plane is probably a better option for most travelers.
If you're in Singapore and you're not sure how to get to Pulau Bintan, you can take a ferry to Bintan. This crossing takes about 2 hours. Alternatively, if you're in Jakarta, then there are quite a few domestic planes that go to Bintan, a 1.5 hour hop.
For more info on the flight to Anambas, including the ticket price, departure time, click flight to anambas