Scheduled backups over SFTP to Synology

Hi everybody!

I think I've tried everything.

I dont want to enable full SSH, just SFTP. Synology offers this option. I can connect from the server to the synology drive via sftp command but backup scripts runs "ssh://user:pass@domain:port/dir" not "sftp -P port server".

The other option would be to use FTPS, but I noticed from a thread that FTPS isn't an option.

Can I use some form of encrypted connection to copy backups to a remote Synology (latest software)?

OS: Centos 7 64bit

Thanks!