Hello MoRpHiUS_x,

Please, can you give me the log file of your backup action ?

Sometimes, i have this error but the FTP services have problem on AZBOX official firmware. I start again backup and the FTP get me finally my backup.
I made intensive FTP test of my code with FTP connect on other system like Ubuntu,
and i never get this error... but i'm not immune to error code with all cases of domestic network that can meet Jazup.

Please, can you verify if your FTP service running and reboot your box and try again? Thanks.
I try to understand the problem you meet, Thanks.

Regards.

Hectore