diff --git a/src/api3/admin/datastore/upload_catar.rs b/src/api3/admin/datastore/upload_catar.rs
index f7a0cbb4..114443bc 100644
--- a/src/api3/admin/datastore/upload_catar.rs
+++ b/src/api3/admin/datastore/upload_catar.rs
@@ -11,6 +11,7 @@ use serde_json::Value;
 use std::io::Write;
 use futures::*;
 use std::path::PathBuf;
+use std::sync::Arc;
 
 use hyper::Body;
 use hyper::http::request::Parts;
@@ -48,7 +49,12 @@ fn upload_catar(parts: Parts, req_body: Body, param: Value, _info: &ApiUploadMet
     let store = tools::required_string_param(&param, "store")?;
     let archive_name = tools::required_string_param(&param, "archive_name")?;
 
-    println!("Upload {}.catar to {} ({}.aidx)", archive_name, store, archive_name);
+    let backup_type = tools::required_string_param(&param, "type")?;
+    let backup_id = tools::required_string_param(&param, "id")?;
+    let backup_time = tools::required_integer_param(&param, "time")?;
+
+    println!("Upload {}.catar to {} ({}/{}/{}/{}.aidx)", archive_name, store,
+             backup_type, backup_id, backup_time, archive_name);
 
     let content_type = parts.headers.get(http::header::CONTENT_TYPE)
         .ok_or(format_err!("missing content-type header"))?;
@@ -61,10 +67,14 @@ fn upload_catar(parts: Parts, req_body: Body, param: Value, _info: &ApiUploadMet
 
     let datastore = DataStore::lookup_datastore(store)?;
 
+    let mut path = datastore.create_backup_dir(backup_type, backup_id, backup_time)?;
+
     let mut full_archive_name = PathBuf::from(archive_name);
     full_archive_name.set_extension("aidx");
 
-    let index = datastore.create_archive_writer(&full_archive_name, chunk_size).unwrap();
+    path.push(full_archive_name);
+
+    let index = datastore.create_archive_writer(path, chunk_size).unwrap();
 
     let upload = UploadCaTar { stream: req_body, index, count: 0};
 
@@ -87,5 +97,11 @@ pub fn api_method_upload_catar() -> ApiUploadMethod {
         ObjectSchema::new("Upload .catar backup file.")
             .required("store", StringSchema::new("Datastore name."))
             .required("archive_name", StringSchema::new("Backup archive name."))
+            .required("type", StringSchema::new("Backup type.")
+                      .format(Arc::new(ApiStringFormat::Enum(vec!["ct".into(), "host".into()]))))
+            .required("id", StringSchema::new("Backup ID."))
+            .required("time", IntegerSchema::new("Backup time (Unix epoch.)")
+                      .minimum(1547797308))
+
     )
 }
diff --git a/src/backup/datastore.rs b/src/backup/datastore.rs
index 1bfd57b4..35b2acc3 100644
--- a/src/backup/datastore.rs
+++ b/src/backup/datastore.rs
@@ -10,6 +10,8 @@ use super::chunk_store::*;
 use super::image_index::*;
 use super::archive_index::*;
 
+use chrono::{Utc, TimeZone};
+
 pub struct DataStore {
     chunk_store: Arc<ChunkStore>,
     gc_mutex: Mutex<bool>,
@@ -87,7 +89,7 @@ impl DataStore {
 
         Ok(index)
     }
- 
+
     pub fn open_archive_reader<P: AsRef<Path>>(&self, filename: P) -> Result<ArchiveIndexReader, Error> {
 
         let index = ArchiveIndexReader::open(self.chunk_store.clone(), filename.as_ref())?;
@@ -95,11 +97,44 @@ impl DataStore {
         Ok(index)
     }
 
+    pub fn base_path(&self) -> PathBuf {
+        self.chunk_store.base_path()
+    }
+
+    pub fn create_backup_dir(
+        &self,
+        backup_type: &str,
+        backup_id: &str,
+        backup_time: i64,
+    ) ->  Result<PathBuf, Error> {
+        let mut relative_path = PathBuf::new();
+
+        relative_path.push(backup_type);
+
+        relative_path.push(backup_id);
+
+        let dt = Utc.timestamp(backup_time, 0);
+        let date_str = dt.format("%Y-%m-%dT%H:%M:%S").to_string();
+
+        println!("date: {}", date_str);
+
+        relative_path.push(&date_str);
+
+
+        let mut full_path = self.base_path();
+        full_path.push(&relative_path);
+
+        std::fs::create_dir_all(&full_path)?;
+
+        Ok(relative_path)
+    }
+
     pub fn list_images(&self) -> Result<Vec<PathBuf>, Error> {
-        let base = self.chunk_store.base_path();
+        let base = self.base_path();
 
         let mut list = vec![];
 
+        // fixme: walk into subdirs ...
         for entry in std::fs::read_dir(base)? {
             let entry = entry?;
             if entry.file_type()?.is_file() {
diff --git a/src/bin/proxmox-backup-client.rs b/src/bin/proxmox-backup-client.rs
index f313344d..aa617ad3 100644
--- a/src/bin/proxmox-backup-client.rs
+++ b/src/bin/proxmox-backup-client.rs
@@ -18,12 +18,21 @@ use proxmox_backup::backup::datastore::*;
 use serde_json::{Value};
 use hyper::Body;
 
-
 fn backup_directory(body: Body, store: &str, archive_name: &str) -> Result<(), Error> {
 
     let client = HttpClient::new("localhost");
 
-    let path = format!("api3/json/admin/datastore/{}/upload_catar?archive_name={}", store, archive_name);
+    let epoch = std::time::SystemTime::now().duration_since(
+        std::time::SystemTime::UNIX_EPOCH)?.as_secs();
+
+    let query = url::form_urlencoded::Serializer::new(String::new())
+        .append_pair("archive_name", archive_name)
+        .append_pair("type", "host")
+        .append_pair("id", &tools::nodename())
+        .append_pair("time", &epoch.to_string())
+        .finish();
+
+    let path = format!("api3/json/admin/datastore/{}/upload_catar?{}", store, query);
 
     client.upload("application/x-proxmox-backup-catar", body, &path)?;