Hi ChenInSA
there are different way to backup photos during a trip:
1. portable CD burner.
good backup, you must have CD's to burn on.
you can burn more than one copy.
pretty slow solution
need batteries
2. portable Hard Disk (I have one) .
fast, unlimited space. but you have only one copy.
need batteries
3. Internet.
best security, but you don't have access to internet all the time, and uploading pictures takes a lots of time
besides, there are sites like flickr (which I am a member of) that can upload pictures from the internet browser without installing, and you don't have to resize your pictures, you can upload the originals but it takes time.
if you are afraid to lose the pictures, you can buy a portable cd burner, burn 2 copies each time, and send one copy home.
Meir