Attic is the holy grail of backups:
RHEL/CentOS don't have native Python 3 packages. Attic requires Python 3.2+.
We'll install Python 3 using IUS repositories here: https://iuscommunity.org/pages/About.html
Always better to use managed than unmanaged installations, which are hard to manage later on.
yum -y install http://dl.iuscommunity.org/pub/ius/stable/CentOS/7/x86_64/ius-release-1.0-13.ius.centos7.noarch.rpm
sed -i 's/enabled=1/enabled=0/' /etc/yum.repos.d/ius.repo
yum --enablerepo=ius install python34u
curl https://attic-backup.org/downloads/releases/0.14/Attic-0.14-linux-x86_64.tar.gz | tar -C /usr/local/share/ -zxf -
ln -s /usr/local/share/Attic-0.14-linux-x86_64/attic /usr/local/bin/attic
attic