For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:darix:restic/openSUSE_Tumbleweed/home:darix:restic.repo
zypper refresh
zypper install rest-server
For openSUSE Leap 15.2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:darix:restic/openSUSE_Leap_15.2/home:darix:restic.repo
zypper refresh
zypper install rest-server
For openSUSE Leap 15.1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:darix:restic/openSUSE_Leap_15.1/home:darix:restic.repo
zypper refresh
zypper install rest-server