deb.kaliko.me now exposes trixie backports.
With this new Debian release you can update sources list with new Debian RFC822 control data format:
Types: deb
URIs: https://deb.kaliko.me/debian-backports/
Suites: trixie-backports
Components: main
Signed-By: /usr/share/keyrings/deb.kaliko.me.gpg
Please see deb.kaliko.me for more.