fix: allow all servers to push version files to backup servers

templates/sshd_config.j2

@@ -21,6 +21,7 @@ X11Forwarding no
 {% if inventory_hostname in groups.backup_server %}
 AllowUsers {{ host_user }}{% if host_user2 is defined %} {{ host_user2 }}{% endif %} {{ (groups.all | difference(groups.backup_server)) | map('extract', hostvars, ['backup_sftp_user']) | sort | join(" ") }}
 AllowGroups {{ host_user }} sftpgroup
+MaxStartups {{ (groups.all | difference(groups.backup_server)) | length + 2}}
 Match Group sftpgroup
       ChrootDirectory /backup/sftp
       ForceCommand internal-sftp