If your system is called Debian Jessie and you want to install borgbackup throw the respository, but get the following error:

user@server ~ $ sudo apt-get install borgbackup
Paketlisten werden gelesen… Fertig
Abhängigkeitsbaum wird aufgebaut.
Statusinformationen werden eingelesen…. Fertig
E: Paket borgbackup kann nicht gefunden werden.

How to Install BorgBackup with Jessie-Backports:

1. Add the Backports:

   echo "deb http://ftp.debian.org/debian jessie-backports main" >> /etc/apt/sources.list

2. Update the APT Cache:

   apt-get update

3. Install the package with backports:

   apt-get -t jessie-backports install borgbackup

4. Remove the Backports again:

   sed -i.bak '/deb http:\/\/ftp.debian.org\/debian jessie-backports main/d' /etc/apt/sources.list

THX! Have Fun with BorgBackup ! 🙂