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Usually, you can live with backing up the files that make a linux install, except the virtual folders (/proc, /sys ... and maybe the logs) and get away with that (best tared and feath^H^H^H^H°Hgnuzipped) just fine - when you have the backups on reliable media, and at least two of them.
When reinstalling the backup, prepare a partitioned drive or pre-setup array from a livecd and play back your files, then chroot to the mounted root dir and adjust fstab and bootloader entries reflecting the new partition ids, then run grub-install or lilo. Complete partition-level backups are rarely of use unless you want to clone your system to a drive with same size and partition setup.
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