This indicates an attack attempt to exploit an Information Disclosure vulnerability in Intelbras NCloud.
The vulnerability is due to an error when the vulnerable software handles an unauthenticated request for backup file. A remote attacker may be able to exploit this to gain access to sensitive data, via an unauthenticated request.
Intelbras NCLOUD 300 1.0 devices
Information Disclosure: Remote attackers can gain sensitive information from vulnerable systems
Currently we are unaware of any vendor supplied patch or updates available for this issue.