The site is for the public-facing part: who you are, membership requirements, products and rates, forms to download, branch contacts, notices and AGM papers.
The member portal, the core banking system and anything that touches balances are a different class of software with their own regulatory requirements. We host websites and email; we do not sell a core banking system. If your provider gives you one to self-host, that is a VPS or dedicated server conversation — talk to us before you order so we can be straight about what fits.