Chapter 5. 3scale backup and restore
https://access.redhat.com/documentation/en-us/red_hat_3scale_api_management/2.7/html/operating_3scale/backup-restore

Section 5.6.2. Restoring system-storage - with respect to backup procedure earlier in the guide current command:
oc rsync ./local/dir $(oc get pods -l 'deploymentConfig=system-app' -o json | jq '.items[0].metadata.name' -r):/opt/system/public/system

Restores data to wrong place. If style of backup command should be preserved than correct form is:
oc rsync ./local/dir/system/ $(oc get pods -l 'deploymentConfig=system-app' -o json | jq '.items[0].metadata.name' -r):/opt/system/public/system