Hi genomax- I agree. However, I think the advantage of going for a direct link is that you can stick in your documentation or script something like wget ftp://ftp.ensembl.org/pub/release-92/gff3/homo_sapiens/Homo_sapiens.GRCh38.92.chr.gff3.gz and that makes self-explanatory what data you are referring to. In my experience (maybe it's just me of course...!) with layers like BioMart either you have to be quite diligent in documenting what you have done or you end up with data that you can be sure how you got.