Storage Pools: Local Disk and Remote NFS
Every VPS disk lives in a Storage Pool - Local Disk by default, backed by ordinary qcow2 files on the host's own filesystem, thin-provisioned and copy-on-write against a shared cached OS base so new VPS and reinstalls are near-instant.
Remote Filesystem (NFS) pools are also supported: point Virtlix at an NFS export and it mounts it automatically, keeps it mounted across reboots, and lets you create VPS disks there exactly like a local pool. Useful for centralizing storage across multiple hosts, or when your fastest/largest storage genuinely lives on a NAS rather than in the server itself.
When adding a storage pool, pick the backend (Local Disk or Remote Filesystem) and, for NFS, the export host and path. Mark one pool as default so new VPS use it automatically unless a different one is picked at creation time.
Ceph RBD, StorPool, and Lightbits NVMe/TCP backends are modeled in the storage pool options for future support, but aren't connected yet - selecting one won't actually provision anything today.