proxmox as nas

Hi all. I have a dedicated server to create NAS, primarily backups data from VMs and hosts. What is the true way for this job: 1. Proxmox as NAS - Install proxmox and configure some "NAS services" (NFS, SMB, FTP)? Can I do this easy (from gui)? 2. Proxmox only using NAS - Install other OS that...