Replying to Traveling w/ Camera

over the summer i will be going to Kenya for 2 1/2 weeks. i will be bringing my canon rebel. i was wondering if you guys have some ideas on how i can store and protect my photos. i dont really want to take my mac book with me but i also dont want to take one SD card (i am just nervous something will happen with no backup) so whats a good way to protect all the photos i will be taking. i know there are backup devices but the ones im looking at are really expensive. thanks guys

also any other tips you can think of would be awesome.