Proxmox has a lot of documentation so we will point you in that direction
See the following links for information:
1. https://pve.proxmox.com/wiki/Storage
2. https://pve.proxmox.com/pve-docs/chapter-pvesm.html
3. https://pbs.proxmox.com/docs/maintenance.html#pruning
