YunoHost 4.1 release / Sortie de YunoHost 4.1

HI team
i have a warning as follow
"It looks like apt (the package manager) is configured to use the backports repository. Unless you really know what you are doing, we strongly discourage from installing packages from backports, because it’s likely to create instabilities or conflicts on your system. "
since i update the release
how can i fix it, im using Debian 10
could you guide me here, what should i modify to make my apt configured not to use backports repo
thanks in advance pascal
#english