diff --git a/Cargo.lock b/Cargo.lock
index e98619b..5838ea3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -112,6 +112,8 @@ dependencies = [
  "prost-types",
  "rocket",
  "rocket_prost_responder_derive",
+ "serde",
+ "serde_json",
  "uuid",
 ]
 
@@ -2041,9 +2043,9 @@ checksum = "6d49784317cd0d1ee7ec5c716dd598ec5b4483ea832a2dced265471cc0f690ae"
 
 [[package]]
 name = "uuid"
-version = "1.18.1"
+version = "1.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2f87b8aa10b915a06587d0dec516c282ff295b475d94abf425d62b57710070a2"
+checksum = "e2e054861b4bd027cd373e18e8d8d8e6548085000e41290d95ce0c373a654b4a"
 dependencies = [
  "getrandom 0.3.4",
  "js-sys",
diff --git a/backend/Cargo.toml b/backend/Cargo.toml
index 15f612f..5f1fa04 100644
--- a/backend/Cargo.toml
+++ b/backend/Cargo.toml
@@ -9,9 +9,11 @@ prost-types = "0.14.1"
 rocket = { git = "https://github.com/rwf2/Rocket", rev = "504efef179622df82ba1dbd37f2e0d9ed2b7c9e4" }
 bytes = "1"
 rocket_prost_responder_derive = { path = "rocket_prost_responder_derive" }
-uuid = { version = "1.10.0", features = ["v4"] }
+uuid = { version = "1.19.0", features = ["v4"] }
 bcrypt = "0.17.1"
 bincode = "2.0.1"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
 
 [build-dependencies]
 prost-build = "0.14.1"
diff --git a/backend/build.rs b/backend/build.rs
index 113518c..757d864 100644
--- a/backend/build.rs
+++ b/backend/build.rs
@@ -10,7 +10,7 @@ fn main() -> Result<(), std::io::Error> {
 
     cfg.type_attribute(
         ".",
-        "#[derive(rocket_prost_responder_derive::RocketResponder)]",
+        "#[derive(rocket_prost_responder_derive::RocketResponder, serde::Serialize, serde::Deserialize)]",
     );
 
     cfg.compile_protos(&["../protobuf/items.proto"], &["../protobuf"])?;
diff --git a/backend/src/main.rs b/backend/src/main.rs
index b100b64..1e641af 100644
--- a/backend/src/main.rs
+++ b/backend/src/main.rs
@@ -1,5 +1,7 @@
-use bincode::{Decode, Encode};
 use rocket::fs::FileServer;
+use serde::{Deserialize, Serialize};
+use std::fs::File;
+use std::io::BufReader;
 use std::sync::Mutex;
 
 use crate::items::Game;
@@ -14,7 +16,7 @@ pub mod items {
 mod auth;
 mod proto_utils;
 
-#[derive(Clone)]
+#[derive(Clone, Serialize, Deserialize)]
 pub struct User {
     pub person: items::Person,
     pub password_hash: String,
@@ -28,6 +30,34 @@ impl std::ops::Deref for User {
     }
 }
 
+#[derive(Serialize, Deserialize)]
+struct PersistentState {
+    games: Vec<Game>,
+    users: Vec<User>,
+}
+
+const STATE_FILE: &str = "state.json";
+
+fn save_state(games: &[Game], users: &[User]) {
+    let state = PersistentState {
+        games: games.to_vec(),
+        users: users.to_vec(),
+    };
+    if let Ok(file) = File::create(STATE_FILE) {
+        let _ = serde_json::to_writer_pretty(file, &state);
+    }
+}
+
+fn load_state() -> Option<(Vec<Game>, Vec<User>)> {
+    if let Ok(file) = File::open(STATE_FILE) {
+        let reader = BufReader::new(file);
+        if let Ok(state) = serde_json::from_reader::<_, PersistentState>(reader) {
+            return Some((state.games, state.users));
+        }
+    }
+    None
+}
+
 #[get("/<name>")]
 fn get_user(
     _token: auth::Token,
@@ -64,10 +94,14 @@ fn get_game(
 #[post("/opinion", data = "<req>")]
 fn add_opinion(
     token: auth::Token,
+
     user_list: &rocket::State<Mutex<Vec<User>>>,
+    game_list: &rocket::State<Vec<Game>>,
     req: proto_utils::Proto<items::AddOpinionRequest>,
 ) -> Option<items::Person> {
     let mut users = user_list.lock().unwrap();
+    let mut result = None;
+
     if let Some(user) = users.iter_mut().find(|u| u.person.name == token.username) {
         let req = req.into_inner();
         let opinion = items::Opinion {
@@ -85,10 +119,13 @@ fn add_opinion(
         } else {
             user.person.opinion.push(opinion);
         }
-        Some(user.person.clone())
-    } else {
-        None
+        result = Some(user.person.clone());
     }
+
+    if result.is_some() {
+        save_state(game_list, &users);
+    }
+    result
 }
 
 #[get("/<_..>", rank = 20)]
@@ -105,28 +142,31 @@ async fn index_fallback() -> Option<rocket::fs::NamedFile> {
 
 #[rocket::main]
 async fn main() -> Result<(), std::io::Error> {
-    let mut game_list: Vec<Game> = Vec::new();
-    let mut user_list: Vec<User> = Vec::new();
+    let (game_list, user_list) = load_state().unwrap_or_else(|| {
+        let mut game_list: Vec<Game> = Vec::new();
+        let mut user_list: Vec<User> = Vec::new();
 
-    game_list.push(Game {
-        title: "Naramo Nuclear Plant V2".to_string(),
-        source: items::Source::Roblox.into(),
-        multiplayer: true,
-        min_players: 1,
-        max_players: 90,
-        price: 0,
-        remote_id: 0,
-    });
+        game_list.push(Game {
+            title: "Naramo Nuclear Plant V2".to_string(),
+            source: items::Source::Roblox.into(),
+            multiplayer: true,
+            min_players: 1,
+            max_players: 90,
+            price: 0,
+            remote_id: 0,
+        });
 
-    user_list.push(User {
-        person: items::Person {
-            name: "John".to_string(),
-            opinion: vec![items::Opinion {
-                title: "Naramo Nuclear Plant V2".to_string(),
-                would_play: true,
-            }],
-        },
-        password_hash: bcrypt::hash("password123", bcrypt::DEFAULT_COST).unwrap(),
+        user_list.push(User {
+            person: items::Person {
+                name: "John".to_string(),
+                opinion: vec![items::Opinion {
+                    title: "Naramo Nuclear Plant V2".to_string(),
+                    would_play: true,
+                }],
+            },
+            password_hash: bcrypt::hash("password123", bcrypt::DEFAULT_COST).unwrap(),
+        });
+        (game_list, user_list)
     });
 
     rocket::build()
diff --git a/state.json b/state.json
new file mode 100644
index 0000000..3b00cfd
--- /dev/null
+++ b/state.json
@@ -0,0 +1,31 @@
+{
+  "games": [
+    {
+      "title": "Naramo Nuclear Plant V2",
+      "source": 1,
+      "multiplayer": true,
+      "min_players": 1,
+      "max_players": 90,
+      "price": 0,
+      "remote_id": 0
+    }
+  ],
+  "users": [
+    {
+      "person": {
+        "name": "John",
+        "opinion": [
+          {
+            "title": "Naramo Nuclear Plant V2",
+            "would_play": true
+          },
+          {
+            "title": "Test2",
+            "would_play": true
+          }
+        ]
+      },
+      "password_hash": "$2b$12$DRvTP/ibTWULkuJJr285bumRd7SG3n5bYkDpb09Qpklqf6FeTiHkC"
+    }
+  ]
+}
\ No newline at end of file