diff --git a/Cargo.lock b/Cargo.lock
index 40e204b..c1ebf86 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1362,7 +1362,7 @@ dependencies = [
 
 [[package]]
 name = "ic-oss"
-version = "0.6.0"
+version = "0.6.1"
 dependencies = [
  "bytes",
  "candid",
@@ -1381,7 +1381,7 @@ dependencies = [
 
 [[package]]
 name = "ic-oss-can"
-version = "0.6.0"
+version = "0.6.1"
 dependencies = [
  "bytes",
  "candid",
@@ -1395,7 +1395,7 @@ dependencies = [
 
 [[package]]
 name = "ic-oss-cli"
-version = "0.6.0"
+version = "0.6.1"
 dependencies = [
  "anyhow",
  "bytes",
@@ -1422,7 +1422,7 @@ dependencies = [
 
 [[package]]
 name = "ic-oss-cose"
-version = "0.6.0"
+version = "0.6.1"
 dependencies = [
  "base64 0.21.7",
  "candid",
@@ -1443,7 +1443,7 @@ dependencies = [
 
 [[package]]
 name = "ic-oss-types"
-version = "0.6.0"
+version = "0.6.1"
 dependencies = [
  "base64 0.21.7",
  "candid",
@@ -1516,7 +1516,7 @@ checksum = "8de254dd67bbd58073e23dc1c8553ba12fa1dc610a19de94ad2bbcd0460c067f"
 
 [[package]]
 name = "ic_oss_bucket"
-version = "0.6.0"
+version = "0.6.1"
 dependencies = [
  "base64 0.21.7",
  "bytes",
@@ -1545,7 +1545,7 @@ dependencies = [
 
 [[package]]
 name = "ic_oss_cluster"
-version = "0.6.0"
+version = "0.6.1"
 dependencies = [
  "base64 0.21.7",
  "bytes",
diff --git a/Cargo.toml b/Cargo.toml
index 609f116..51cc192 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,7 +18,7 @@ strip = true
 opt-level = 's'
 
 [workspace.package]
-version = "0.6.0"
+version = "0.6.1"
 edition = "2021"
 repository = "https://github.com/ldclabs/ic-oss"
 keywords = ["file", "storage", "oss", "s3", "icp"]
diff --git a/examples/ai_canister/src/lib.rs b/examples/ai_canister/src/lib.rs
index 4bd04a9..e1b5c88 100644
--- a/examples/ai_canister/src/lib.rs
+++ b/examples/ai_canister/src/lib.rs
@@ -179,8 +179,6 @@ fn admin_load_model(args: LoadModelInput) -> Result<u64, String> {
 
 #[ic_cdk::init]
 fn init() {
-    state::save();
-    fs::save();
     // state::init_rand();
 }
 
diff --git a/src/ic_oss_bucket/ic_oss_bucket.did b/src/ic_oss_bucket/ic_oss_bucket.did
index 09287b9..19f3d72 100644
--- a/src/ic_oss_bucket/ic_oss_bucket.did
+++ b/src/ic_oss_bucket/ic_oss_bucket.did
@@ -12,11 +12,13 @@ type BTreeMap = vec record {
 };
 type BucketInfo = record {
   status : int8;
+  total_chunks : nat64;
   trusted_eddsa_pub_keys : vec blob;
   managers : vec principal;
   name : text;
   max_custom_data_size : nat16;
   auditors : vec principal;
+  total_files : nat64;
   max_children : nat16;
   enable_hash_index : bool;
   max_file_size : nat64;
@@ -24,8 +26,7 @@ type BucketInfo = record {
   visibility : nat8;
   max_folder_depth : nat8;
   trusted_ecdsa_pub_keys : vec blob;
-  file_count : nat64;
-  folder_count : nat64;
+  total_folders : nat64;
   file_id : nat32;
 };
 type CanisterArgs = variant { Upgrade : UpgradeArgs; Init : InitArgs };
diff --git a/src/ic_oss_bucket/src/api_init.rs b/src/ic_oss_bucket/src/api_init.rs
index bb0bde7..63354b1 100644
--- a/src/ic_oss_bucket/src/api_init.rs
+++ b/src/ic_oss_bucket/src/api_init.rs
@@ -99,7 +99,6 @@ fn init(args: Option<CanisterArgs>) {
         None => {}
     }
 
-    store::state::save();
     store::state::init_http_certified_data();
 }
 
diff --git a/src/ic_oss_bucket/src/api_query.rs b/src/ic_oss_bucket/src/api_query.rs
index 78978e0..af1c5e3 100644
--- a/src/ic_oss_bucket/src/api_query.rs
+++ b/src/ic_oss_bucket/src/api_query.rs
@@ -36,9 +36,7 @@ fn get_bucket_info(access_token: Option<ByteBuf>) -> Result<BucketInfo, String>
 
     Ok(store::state::with(|r| BucketInfo {
         name: r.name.clone(),
-        file_count: r.file_count,
         file_id: r.file_id,
-        folder_count: r.folder_count,
         folder_id: r.folder_id,
         max_file_size: r.max_file_size,
         max_folder_depth: r.max_folder_depth,
@@ -47,6 +45,9 @@ fn get_bucket_info(access_token: Option<ByteBuf>) -> Result<BucketInfo, String>
         enable_hash_index: r.enable_hash_index,
         status: r.status,
         visibility: r.visibility,
+        total_files: store::fs::total_files(),
+        total_chunks: store::fs::total_chunks(),
+        total_folders: store::fs::total_folders(),
         managers: r.managers.clone(),
         auditors: r.auditors.clone(),
         trusted_ecdsa_pub_keys: r.trusted_ecdsa_pub_keys.clone(),
diff --git a/src/ic_oss_bucket/src/store.rs b/src/ic_oss_bucket/src/store.rs
index 4e376d8..9cdb486 100644
--- a/src/ic_oss_bucket/src/store.rs
+++ b/src/ic_oss_bucket/src/store.rs
@@ -34,9 +34,7 @@ type Memory = VirtualMemory<DefaultMemoryImpl>;
 #[derive(Clone, Deserialize, Serialize)]
 pub struct Bucket {
     pub name: String,
-    pub file_count: u64,
     pub file_id: u32,
-    pub folder_count: u64,
     pub folder_id: u32,
     pub max_file_size: u64,
     pub max_folder_depth: u8,
@@ -58,10 +56,8 @@ impl Default for Bucket {
     fn default() -> Self {
         Self {
             name: "default".to_string(),
-            file_count: 0,
             file_id: 0,
-            folder_count: 1, // The root folder 0 is created by default
-            folder_id: 1,
+            folder_id: 1, // The root folder 0 is created by default
             max_file_size: MAX_FILE_SIZE,
             max_folder_depth: 10,
             max_children: 100,
@@ -789,6 +785,18 @@ pub mod state {
 pub mod fs {
     use super::*;
 
+    pub fn total_files() -> u64 {
+        FS_METADATA_STORE.with(|r| r.borrow().len())
+    }
+
+    pub fn total_chunks() -> u64 {
+        FS_CHUNKS_STORE.with(|r| r.borrow().len())
+    }
+
+    pub fn total_folders() -> u64 {
+        FOLDERS.with(|r| r.borrow().len() as u64)
+    }
+
     pub fn get_file_id(hash: &[u8; 32]) -> Option<u32> {
         HASHS.with(|r| r.borrow().get(hash).copied())
     }
@@ -852,7 +860,6 @@ pub mod fs {
                 )?;
 
                 s.folder_id = s.folder_id.saturating_add(1);
-                s.folder_count += 1;
                 Ok(id)
             })
         })
@@ -884,7 +891,6 @@ pub mod fs {
                 }
 
                 s.file_id = s.file_id.saturating_add(1);
-                s.file_count += 1;
                 parent.files.insert(id);
                 FS_METADATA_STORE.with(|r| r.borrow_mut().insert(id, metadata));
                 Ok(id)
diff --git a/src/ic_oss_can/src/lib.rs b/src/ic_oss_can/src/lib.rs
index 05e2619..b34b9c3 100644
--- a/src/ic_oss_can/src/lib.rs
+++ b/src/ic_oss_can/src/lib.rs
@@ -36,8 +36,6 @@ mod test {
 
     #[test]
     fn test_ic_oss_fs() {
-        fs::set_max_file_size(1024 * 1024);
-
         let files = fs::list_files(u32::MAX, 2);
         assert!(files.is_empty());
 
diff --git a/src/ic_oss_can/src/store.rs b/src/ic_oss_can/src/store.rs
index 3b872fe..e33cacb 100644
--- a/src/ic_oss_can/src/store.rs
+++ b/src/ic_oss_can/src/store.rs
@@ -4,6 +4,7 @@
 #[macro_export]
 macro_rules! ic_oss_fs {
     () => {
+        #[allow(dead_code)]
         pub mod fs {
             use candid::Principal;
             use ciborium::{from_reader, into_writer};
@@ -65,6 +66,10 @@ macro_rules! ic_oss_fs {
                 });
             }
 
+            pub fn total_chunks() -> u64 {
+                FS_CHUNKS_STORE.with(|r| r.borrow().len())
+            }
+
             pub fn get_file(id: u32) -> Option<FileMetadata> {
                 if id == 0 {
                     return None;
@@ -82,13 +87,12 @@ macro_rules! ic_oss_fs {
                         Err(format!("file size exceeds limit: {}", r.max_file_size))?;
                     }
 
-                    let id = r.file_id.saturating_add(1);
+                    let id = r.file_id;
                     if id == u32::MAX {
                         Err("file id overflow".to_string())?;
                     }
 
-                    r.file_id = id;
-                    r.file_count += 1;
+                    r.file_id = id.saturating_add(1);
                     r.files.insert(id, file);
                     Ok(id)
                 })
diff --git a/src/ic_oss_can/src/types.rs b/src/ic_oss_can/src/types.rs
index 705488b..412dcf0 100644
--- a/src/ic_oss_can/src/types.rs
+++ b/src/ic_oss_can/src/types.rs
@@ -11,10 +11,9 @@ use std::{
 
 pub const MILLISECONDS: u64 = 1_000_000_000;
 
-#[derive(Clone, Default, Deserialize, Serialize)]
+#[derive(Clone, Deserialize, Serialize)]
 pub struct Files {
     pub file_id: u32,
-    pub file_count: u64,
     pub max_file_size: u64,
     pub visibility: u8,                // 0: private; 1: public
     pub managers: BTreeSet<Principal>, // managers can read and write
@@ -41,6 +40,18 @@ impl Files {
     }
 }
 
+impl Default for Files {
+    fn default() -> Self {
+        Self {
+            file_id: 1, // 0 is reserved for the Files data itself
+            max_file_size: MAX_FILE_SIZE,
+            visibility: 0,
+            managers: BTreeSet::new(),
+            files: BTreeMap::new(),
+        }
+    }
+}
+
 impl Storable for Files {
     const BOUND: Bound = Bound::Unbounded;
 
diff --git a/src/ic_oss_types/src/bucket.rs b/src/ic_oss_types/src/bucket.rs
index 386e3cf..215a294 100644
--- a/src/ic_oss_types/src/bucket.rs
+++ b/src/ic_oss_types/src/bucket.rs
@@ -8,9 +8,7 @@ use crate::{file::MAX_FILE_SIZE, ByteN};
 #[derive(CandidType, Clone, Debug, Default, Deserialize, Serialize, PartialEq, Eq)]
 pub struct BucketInfo {
     pub name: String,
-    pub file_count: u64,
     pub file_id: u32,
-    pub folder_count: u64,
     pub folder_id: u32,
     pub max_file_size: u64,
     pub max_folder_depth: u8,
@@ -19,6 +17,9 @@ pub struct BucketInfo {
     pub enable_hash_index: bool,
     pub status: i8,     // -1: archived; 0: readable and writable; 1: readonly
     pub visibility: u8, // 0: private; 1: public
+    pub total_files: u64,
+    pub total_chunks: u64,
+    pub total_folders: u64,
     pub managers: BTreeSet<Principal>, // managers can read and write
     // auditors can read and list even if the bucket is private
     pub auditors: BTreeSet<Principal>,