I needed it to solved the issue «/usr/lib/python2.7/dist-packages/paramiko/ecdsakey.py:164: CryptographyDeprecationWarning: Support for unsafe construction of public numbers from encoded data will be removed in a future version» with Backupninja / Duplicity.
I have added buster-backports to /etc/apt/sources.list:
deb http://ftp.debian.org/debian buster-backports main
backports.debian.org/Instructions/#index2h2
aptitude -t buster-backports install "python-paramiko"
backports.debian.org/Instructions/#index3h2
