I use Softaculous on all my servers, and with that comes a free licence for Backuply. As long as you're not running an ARM server, this is a very cost effective solution for backing up and works very well. (prices start from $2 a month per server) I actually prefer it over software i've tried in past like JetBackup (for example). For transparency, I use local servers and also offsite datacentre backup storage and Backuply works perfectly.
You can use DA's built in backup features and use FTP/SCP from the Admin panel but i've found that problematic in past (personally). I know @zEitEr wrote a tutorial on how to setup backups with FTP somewhere in the forum/docs so it might pay you to search that out. Here's the options DA give you if you want to use their backup to remote options
It has all the required IPs to whitelist in your firewall, and installation instructions. Takes ~2 mins to add the IPs and run install script. When you've installed, it will appear in your DA panel as Softaculous Auto Installer, and Backuply.