I'm trying to use partimage to create an archive of an Ubuntu version I'm no longer using.
When I run partimage, it tells me that the used space on the partition is 6.10 Gigs. This seems odd because other tools (df, du, disk usage analyzer) say that used space is around 2.5 Gig. The compressed (with gzip) partimage file is 861M, which of course isn't meaningful. So I ran it again uncompressed, and the result was 6282M - consistent with what partimage told me.
Does this make sense? Why the big difference? Is this caused by thousands of files each with large block sizes? I'd like to know that I have a good archive before I go to the next step - replacing the Ubuntu version with a later one.