Lost most of my clients

I’m not sure what happened but I had setup 7 clients, most were Internet clients and had no issues getting them backed up. Today I look at the server only shows 1 client which happens to be a local client. I looked at the backup directory and I see the backup files are still there. So I added one of the clients back but the server doesn’t see the backup. I am running version 2.4.11 on CentOS 7. I have not updated the system recently. How do I add the clients back so that they can see their previous backups?