not nero burn nero backitup

whatever the size of your ex2 partition is the size of the uncompressed backup

but nero compresses it .

For me my ext2 partition was 823.65mb but nero says the compressed size
is 169.34mb

but when I go and look at the actual file nero made its only 64.4mb


You dont burn the image to disk at all

you simply restore it using nero backitup

Find the partition you want to use and use backitup to restore