Maybe have a look at urbackup. Gui, “centrally managed”, free…
And please, as mentioned in another comment, have a look at Borgmatic. It makes Borg really easy to use and has some super handy features. Super easy backups to multiple locations by just adding a line in the config… And I just love the healthchecks integration. Set and forget until either healthchecks notifies you of a problem or you really need to recover data.
When I got started I preferred GUI apps too. The more you use them, the more you get to appreciate cli tools. Meanwhile I find cli tools better, they are just more precise and have a good way to push you to use them correctly. Also they are mostly well documented and even offer “on the fly” help with -h flags or alike… also the get started page of Borgmatic is really well written. Just play around with it ;)