Issue with restoring of point in time backup topics

[shanmukha511]

Have created strimzi cluster and created 2 topics and produced messages to respective topics and took backup called backup-1. so the backup-1 would contains 2 topics along with messages. And assume the cluster got crashed and will create new cluster and restore the backup-1 and we can see 2 topics along with the messages after restoring creating 2 more topics and few messages produced to the respective topic. And take backup of cluster state called backup2. So the backup2 should container earlier restored topics and along with new topics as well.But what happening it getting new topics and its messages but not getting old topics messages (backup-1) which were earlier restored to cluster .

Is that how kafka-backup works?

question: is like the backup-2 should contain all topics with messages which are restored from earlier backup?