Debian Fast Track is a repository that allows making “backports” of packages available to users of the stable distribution, if those packages cannot be maintained in testing and backported in the usual way.
Add the following lines to /etc/apt/sources.list on your buster system.
deb http://fasttrack.debian.net/debian/ buster-fasttrack main contrib
deb http://fasttrack.debian.net/debian/ buster-backports main contrib
Note: You will also need buster-backports enabled, see backports website for instructions.
Signing key for the archive is fasttrack-archive-key.asc
We are setting up this service, please check FastTrack page on Debian Wiki for uploading packages to the Debian Fast Track repository.