In my story a civilization has reached the point where they want to colonize another planet. They encounter a problem. Their spaceship can only carry a crew of eight (8) people. 

**Specifics of the journey:**

-The voyage takes approximately seven (7) years and covers a distance of 2.3 light years.

-The technology available regarding life support and computing systems are comparable to current day modern tech.

-People cannot be kept in stasis for any amount of time.

-The civilization has access to "magetech" which is an alternate evolution of technology in conjunction with magic. But this technology is very expensive and scarce due to its resource requirements.

-People who wield magic, can only generate energy. Water/food or conjuration of any other nature does not exist. 

-Teleportation isn't a thing. (Why else would they take a spaceship if they could just teleport right over there?)

* There are no magical means by which the crew can augment their existence on their journey.

What are realistic reasons for a spaceship to set out to settle on a new planet, that can only take eight (8) people on its journey?