For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/isv:SUSEInfra:Backup:Bareos/openSUSE_Tumbleweed/isv:SUSEInfra:Backup:Bareos.repo
zypper refresh
zypper install sccache
For openSUSE Factory zSystems run the following as root:
zypper addrepo https://download.opensuse.org/repositories/isv:SUSEInfra:Backup:Bareos/openSUSE_Factory_zSystems/isv:SUSEInfra:Backup:Bareos.repo
zypper refresh
zypper install sccache
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/isv:SUSEInfra:Backup:Bareos/15.6/isv:SUSEInfra:Backup:Bareos.repo
zypper refresh
zypper install sccache