Agree, because compression depends on data being compressed. One can see that in a study I cited at
Possible to change compression module later on? linking to Modern Lossless Compression Techniques: Review, Comparison and Analysis. I think I found that by searching for compressors Duplicati can offer…
Perhaps @ned can say something about the total situation, why compression seems important over all else, size of files and backup, value of historical backup versions (lost on a start from scratch), and so on. Maybe there are some other options that should be changed (depending on needs) if a fresh start is done.