Error remote 550 FTP

please i have a problem

when automatic backup to ftp is executed it executes error 550 remote access

The server says you can’t access what you’re trying to access.
Are you sure the server is set up right?
Does server keep any logs that might show what it doesn’t like?
Does the “Test connection” button on Destination screen work?
Does switching from “FTP” into “FTP (Alternative)” work better?
I sort of recall embedded space bugs, so test paths without any.