diff --git a/Cargo.toml b/Cargo.toml
index 7e32ff1..5ebd6d6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -17,6 +17,7 @@ base64 = "0.11.0"
 reqwest = "0.9.22"
 sequoia-openpgp = "0.12.0"
 oss-rust-sdk = "0.1.12"
+chrono = "0.4.10"
 rust_util = { git = "https://github.com/jht5945/rust_util" }
 
 
diff --git a/oss-backupd-config.json b/oss-backupd-config.json
new file mode 100644
index 0000000..37ca66d
--- /dev/null
+++ b/oss-backupd-config.json
@@ -0,0 +1,18 @@
+{
+    "oss_config": {
+        "endpoint": "",
+        "access_key_id": "",
+        "access_key_secret": "",
+        "bucket": "",
+        "path": ""
+    },
+    "host": "sample_host",
+    "encrypt_pubkey_file": "",
+    "items": [
+        {
+            "oss_config": null,
+            "target": "",
+            "file_name": "sample_file",
+        }
+    ]
+}
\ No newline at end of file
diff --git a/src/config_util.rs b/src/config_util.rs
index ca432ec..7fd88d3 100644
--- a/src/config_util.rs
+++ b/src/config_util.rs
@@ -7,6 +7,10 @@ use rust_util::{
     new_box_ioerror,
     util_msg::*,
 };
+use chrono::{
+    prelude::*,
+    Utc,
+};
 
 pub const ETC_OSS_BACKUPD_CONFIG: &str = "/etc/oss-backupd/config.json";
 pub const OSS_BACKUPD_CONFIG: &str = "oss-backupd-config.json";
@@ -21,12 +25,14 @@ pub const DOT_OSS_BACKUPD_CONFIG: &str = ".oss-backupd-config.json";
         "bucket": "",
         "path": ""
     },
-    encrypt_pubkey_file: "",
+    "host": "",
+    "encrypt_pubkey_file": "",
     "items": [
         {
             "oss_config": null,
             "target": "",
-            "encrypt_pubkey_file": ""
+            "file_name": "",
+            "encrypt_pubkey_file": null
         }
     ]
 }
@@ -42,18 +48,64 @@ pub struct OSSConfig {
 
 pub struct OSSBackupdConfigItem {
     pub target: Option<String>,
+    pub file_name: Option<String>,
     pub oss_config: Option<OSSConfig>,
     pub encrypt_pubkey_file: Option<String>,
 }
 
 pub struct OSSBackupdConfig {
     pub oss_config: Option<OSSConfig>,
+    pub prefix: Option<String>,
+    pub host: Option<String>,
     pub items: Vec<OSSBackupdConfigItem>,
 }
 
+pub fn make_oss_key(oss_backupd_config: &OSSBackupdConfig, oss_backupd_config_item: &OSSBackupdConfigItem, suffix: &str) -> String {
+    let mut key = String::with_capacity(1024);
+    key.push_str(&(if oss_backupd_config.prefix.is_some() {
+       remove_start_end_slash(&oss_backupd_config.prefix.as_ref().unwrap().as_str())
+    } else {
+        "default_oss_backupd".to_string()
+    }));
+    key.push_str("/");
+    key.push_str(&(if oss_backupd_config.host.is_some() {
+        remove_start_end_slash(&oss_backupd_config.host.as_ref().unwrap().as_str())
+    } else {
+        "default_host".to_string()
+    }));
+    key.push_str("/");
+    key.push_str(if oss_backupd_config_item.file_name.is_some() {
+        oss_backupd_config_item.file_name.as_ref().unwrap().as_str()
+    } else {
+        "default_file_name"
+    });
+    key.push_str("_");
+    let ymdhms = Utc::now().format("%Y%m%d_%H%M%S").to_string();
+    key.push_str(&ymdhms);
+
+    if suffix != "" {
+        key.push_str(&format!(".{}", suffix));
+    }
+
+    key
+}
+
+pub fn remove_start_end_slash(s: &str) -> String {
+    let mut ss = s;
+    while ss.starts_with("/") {
+        ss = &ss[1..]
+   }
+   while ss.ends_with("/") {
+        ss = &ss[0..(ss.len() - 1)];
+   }
+   ss.to_string()
+}
+
 pub fn parse_config(config_json: &json::JsonValue) -> OSSBackupdConfig {
     let root_oss_config_object = parse_sub_oss_config(config_json);
     let encrypt_pubkey_file = get_string_value(config_json, "encrypt_pubkey_file");
+    let prefix = get_string_value(config_json, "prefix");
+    let host = get_string_value(config_json, "host");
     let items = &config_json["items"];
     let mut items_objects: Vec<OSSBackupdConfigItem> = vec![];
     if items.is_array() {
@@ -64,12 +116,15 @@ pub fn parse_config(config_json: &json::JsonValue) -> OSSBackupdConfig {
 
     OSSBackupdConfig {
         oss_config: root_oss_config_object,
+        prefix: prefix,
+        host: host,
         items: items_objects,
     }
 }
 
 pub fn parse_oss_backupd_config_item(item: &json::JsonValue, root_oss_config_object: &Option<OSSConfig>, root_encrypt_pubkey_file: &Option<String>) -> OSSBackupdConfigItem {
     let target = get_string_value(item, "target");
+    let file_name = get_string_value(item, "file_name");
     let mut encrypt_pubkey_file = get_string_value(item, "encrypt_pubkey_file");
     let mut oss_config = parse_sub_oss_config(item);
     if oss_config.is_some() && root_oss_config_object.is_some() {
@@ -100,6 +155,7 @@ pub fn parse_oss_backupd_config_item(item: &json::JsonValue, root_oss_config_obj
 
     OSSBackupdConfigItem {
         target: target,
+        file_name: file_name,
         oss_config: oss_config,
         encrypt_pubkey_file: encrypt_pubkey_file,
     }