Right there on the backup page, when you select the ssh option, below it you can set the port to use. From your log above, you didn’t do that. I’m suggesting you try it, or at least tell us if you did.
Uploading archive to SSH server myipadress hiden…
… upload failed! user@myipadress hiden’s password: scp: /backups/backup-24.10.17.tar.gz: No such file or directory
Backup failed! See the progress output above for the reason why.
It doesn’t get port portion like it doesnt exisit.
I have tried via scp command line and its working just fine
No issues here doing hostname:port in virtualmin scheduled backups. I to have non standard port number.
Those 2 errors you listed are different. The 1st says cant login at all. The 2nd says cant find the folder. Which is it? So on the second, Looks like login works now so just make sure the folder it is looking for exists on the destination. I can tell you the path /backups/backup-24.10.17.tar.gz is wrong. It has to be full path. like /home/username/backups/backup-24.10.17.tar.gz