Provider: Selfhosted
Virtualization Type: BareMetal
System: Ubuntu 18.04
Installation option: -
Enterprise
Installing from official server or mirror server?
official
Install Memcached extension for PHP?
yes
Install LiteSpeed Memcached?
yes
Install Memcached?
yes
Install Redis extension for PHP?
yes
Install Redis?
yes
Problem:
I try to add remote backup destination (sftp). Every try to save it ends with “wrong password”
If you add a new backup destination and choose SFTP you can enter 
Name
IP Address
Username
Password
Port
Path
Unfortunally every try I did ends with “wrong password”.
After study logfiles on server and destination-server, I figured out, that the entered username is completely ignored!
Backup tries ever with username “root” and ignores the entered username.
Entered a root account to the same server in the Backup destination dialog works.
This is a big bug! Most professional backup destinations are only usable with a username. You never ever get the “root” account.
So please: Fix it!
Thanks,
Kai