Add the pg_probackup3 package repository by running the pgpro-repo-add.sh script. Note that the script requires execute permissions and superuser privileges:

wget https://repo.postgrespro.ru/pg_probackup3/pg_probackup3/keys/pgpro-repo-add.sh
chmod +x pgpro-repo-add.sh
sudo ./pgpro-repo-add.sh

Install the packages.

On Debian family systems:

sudo apt update
sudo apt install pg-probackup3

On Red Hat family systems:

sudo dnf install pg-probackup3

You may need to use yum instead of dnf on older systems.

Print the pg_probackup3 version to verify the installation:

pg_probackup3 --version