Both/either. As the pricing page says, it’s $60/yr plus optional cloud storage in The Relica Cloud. If you bring your own cloud storage, it’s not extra:
If I use my own cloud storage, does this pricing apply?
The cloud storage pricing shown on this page is for the managed Relica Cloud, which we recommend for most customers. However, there is no extra charge for backing up to your own cloud storage but you will have to set up and maintain it yourself.
There’s a lot of good information in these bullet points too, including what you get with the membership:
Basically a membership gives you unlimited backup for all your devices, except to the Relica Cloud, which is billled by usage (per GB).