diff --git a/playbooks/files/configs/public-reverse-proxy/nginx/acme_challenge.conf b/playbooks/files/configs/public-reverse-proxy/nginx/acme_challenge.conf
index 0f5321f..f5c9a8e 100644
--- a/playbooks/files/configs/public-reverse-proxy/nginx/acme_challenge.conf
+++ b/playbooks/files/configs/public-reverse-proxy/nginx/acme_challenge.conf
@@ -12,6 +12,7 @@ map $host $upstream_acme_challenge_host {
     keycloak-admin.ccchh.net 10.31.206.12:31820;
     esphome.ccchh.net 10.31.208.24:31820;
     aes.ccchh.net 10.31.206.14:31820;
+    proxmox-backup-server.ccchh.net 10.31.208.28;
     default "";
 }