Clamav updates?

I need to know if Fedora updates clamav using diffs. I had a problem with the bunuts because it would download the whole db all over again – 300+ MB at full bandwidth rate ~10MB/S every hour. I changed the configs as per clamav docs. but to no avail.

I live in a country where Internet is very expensive and bandwidth caps are low. I cannot use a distro that sucks up bandwidth like that.

Debian worked as expected but since then Buster, has begun bloating my old Acer TravelMate, bogging it down too much.

Can anyone confirm clamav behavior on Fedora for me?

Thank you kindly for all your help?