For a complete backup, you need to backup both the BOOT0/1 and the RAW GPP.
Alternatively, if you want to save some time and space, you really only need the BOOT0/1 and the eMMC SYS. This is the same as a complete backup, except it skips the optional USER partition (your personal settings, files, etc.).
Edit: The USER partition is very big, even if you dont have anything, so a lot of people skip it. Compressing your backups can save a lot of space if you don't have any games installed to your internal storage.