hosts/artemis: update README.md

hosts/artemis/README.md

@@ -2,7 +2,7 @@
 
 ## Overview
 
-Couch gaming PC and media centre
+Home theatre and gaming PC
 
 ## Specs
 
@@ -25,16 +25,24 @@ WD Black SN850X | `/dev/nvme0n1p1` (EFI, 500 MiB, NixOS Boot) <br> `/dev/nvme0n1
 rpool/
 ├── local
 │   ├── nix
-│   └── tmp
-├── system
 │   ├── root
-│   └── var
-└── user
-    └── home
+│   └── state
+└── safe
+    └── persist
 ```
 
 See [Graham Christensen's article](https://grahamc.com/blog/nixos-on-zfs/#datasets) for the motivation behind these datasets.
 
+#### Impermanence
+
+This machine uses [impermanence](https://github.com/nix-community/impermanence) and is rolled back to a clean state on each reboot.
+
+Mountpoint | Persists across reboots? | Backed up?
+--- | --- | ---
+`/` | No | Yes
+`/state` | Yes | No
+`/persist` | Yes | Yes
+
 ### Networks
 
 - DHCP on `10.0.1.0/24` subnet.