diff --git a/.gitignore b/.gitignore
index 1f29647..b58488e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@ build/
 .gradle/
 auth.dat
 dc.dat
+data/
diff --git a/build.gradle b/build.gradle
index c227b16..45adfc8 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,7 +1,7 @@
 apply plugin: 'java'
 apply plugin: 'application'
 
-mainClassName= 'de.fabianonline.telegram_backup.Main'
+mainClassName= 'de.fabianonline.telegram_backup.CommandLineRunner'
 
 repositories {
 	mavenCentral()
@@ -12,6 +12,7 @@ repositories {
 
 dependencies {
 	compile 'com.github.badoualy:kotlogram:0.0.6'
+	compile 'org.xerial:sqlite-jdbc:3.8.11.2'
 }
 
 run {
diff --git a/src/main/java/de/fabianonline/telegram_backup/ApiStorage.java b/src/main/java/de/fabianonline/telegram_backup/ApiStorage.java
index 44ddf38..84955f4 100644
--- a/src/main/java/de/fabianonline/telegram_backup/ApiStorage.java
+++ b/src/main/java/de/fabianonline/telegram_backup/ApiStorage.java
@@ -11,55 +11,108 @@ import java.io.FileNotFoundException;
 import java.io.IOException;
 
 class ApiStorage implements TelegramApiStorage {
-	public void saveAuthKey(AuthKey authKey) { 
-		try {
-			FileUtils.writeByteArrayToFile(Config.FILE_AUTH_KEY, authKey.getKey());
-		} catch (IOException e) {
-			e.printStackTrace();
+	private String prefix = null;
+	private boolean do_save = false;
+	private AuthKey auth_key = null;
+	private DataCenter dc = null;
+	private File file_auth_key = null;
+	private File file_dc = null;
+	
+	public ApiStorage(String prefix) {
+		this.setPrefix(prefix);
+	}
+	
+	public void setPrefix(String prefix) {
+		this.prefix = prefix;
+		this.do_save = (this.prefix!=null);
+		if (this.do_save) {
+			String base = Config.FILE_BASE +
+				File.separatorChar +
+				this.prefix +
+				File.separatorChar;
+			this.file_auth_key = new File(base + Config.FILE_NAME_AUTH_KEY);
+			this.file_dc = new File(base + Config.FILE_NAME_DC);
+			this._saveAuthKey();
+			this._saveDc();
+		} else {
+			this.file_auth_key = null;
+			this.file_dc = null;
+		}
+	}
+	
+	public void saveAuthKey(AuthKey authKey) {
+		this.auth_key = authKey;
+		this._saveAuthKey();
+	}
+	
+	private void _saveAuthKey() {
+		if (this.do_save && this.auth_key!=null) {
+			try {
+				FileUtils.writeByteArrayToFile(this.file_auth_key, this.auth_key.getKey());
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
 		}
 	}
 	
 	public AuthKey loadAuthKey() {
-		try {
-			return new AuthKey(FileUtils.readFileToByteArray(Config.FILE_AUTH_KEY));
-		} catch (IOException e) {
-			if (!(e instanceof FileNotFoundException)) e.printStackTrace();
+		if (this.auth_key != null) return this.auth_key;
+		if (this.file_auth_key != null) {
+			try {
+				return new AuthKey(FileUtils.readFileToByteArray(this.file_auth_key));
+			} catch (IOException e) {
+				if (!(e instanceof FileNotFoundException)) e.printStackTrace();
+			}
 		}
 		
 		return null;
 	}
 	
 	public void saveDc(DataCenter dc) {
-		try {
-			FileUtils.write(Config.FILE_DC, dc.toString());
-		} catch (IOException e) {
-			e.printStackTrace();
+		this.dc = dc;
+		this._saveDc();
+	}
+	
+	private void _saveDc() {
+		if (this.do_save && this.dc != null) {
+			try {
+				FileUtils.write(this.file_dc, this.dc.toString());
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
 		}
 	}
 	
 	public DataCenter loadDc() {
-		try {
-			String[] infos = FileUtils.readFileToString(Config.FILE_DC).split(":");
-			return new DataCenter(infos[0], Integer.parseInt(infos[1]));
-		} catch (IOException e) {
-			if (!(e instanceof FileNotFoundException)) e.printStackTrace();
+		if (this.dc != null) return this.dc;
+		if (this.file_dc != null) {
+			try {
+				String[] infos = FileUtils.readFileToString(this.file_dc).split(":");
+				return new DataCenter(infos[0], Integer.parseInt(infos[1]));
+			} catch (IOException e) {
+				if (!(e instanceof FileNotFoundException)) e.printStackTrace();
+			}
 		}
 		return null;
 	}
 	
 	public void deleteAuthKey() {
-		try {
-			FileUtils.forceDelete(Config.FILE_AUTH_KEY);
-		} catch (IOException e) {
-			e.printStackTrace();
+		if (this.do_save) {
+			try {
+				FileUtils.forceDelete(this.file_auth_key);
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
 		}
 	}
 	
 	public void deleteDc() {
-		try {
-			FileUtils.forceDelete(Config.FILE_DC);
-		} catch (IOException e) {
-			e.printStackTrace();
+		if (this.do_save) {
+			try {
+				FileUtils.forceDelete(this.file_dc);
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
 		}
 	}
 	
diff --git a/src/main/java/de/fabianonline/telegram_backup/CommandLineController.java b/src/main/java/de/fabianonline/telegram_backup/CommandLineController.java
new file mode 100644
index 0000000..d2b1acc
--- /dev/null
+++ b/src/main/java/de/fabianonline/telegram_backup/CommandLineController.java
@@ -0,0 +1,150 @@
+package de.fabianonline.telegram_backup;
+
+import com.github.badoualy.telegram.api.Kotlogram;
+import com.github.badoualy.telegram.api.TelegramApp;
+import com.github.badoualy.telegram.api.TelegramClient;
+import com.github.badoualy.telegram.tl.exception.RpcErrorException;
+
+import de.fabianonline.telegram_backup.Config;
+import de.fabianonline.telegram_backup.ApiStorage;
+import de.fabianonline.telegram_backup.UserManager;
+import de.fabianonline.telegram_backup.DownloadManager;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Scanner;
+
+public class CommandLineController {
+	private ApiStorage storage;
+	private CommandLineOptions options;
+	public TelegramApp app;
+	public UserManager user = null;
+	
+	public CommandLineController(String[] args) {
+		options = new CommandLineOptions(args);
+		if (options.cmd_help) this.show_help();
+		if (options.cmd_list_accounts) this.list_accounts();
+		if (options.account==null && !options.cmd_login) {
+			show_error("You neither used --login nor did you give an account using --account. You need to use one of those two.\nPlease have a look at --help.");
+		}
+		
+		app = new TelegramApp(Config.APP_ID, Config.APP_HASH, Config.APP_MODEL, Config.APP_SYSVER, Config.APP_APPVER, Config.APP_LANG);
+		if (options.cmd_debug) Kotlogram.setDebugLogEnabled(true);
+		
+		if (options.account != null && !options.cmd_login) {
+			storage = new ApiStorage(options.account);
+		} else {
+			storage = new ApiStorage(null);
+		}
+		TelegramClient client = Kotlogram.getDefaultClient(app, storage);
+		
+		try {
+			user = new UserManager(client);
+			
+			if (options.cmd_login) {
+				System.out.println("Please enter your phone number in international format.");
+				System.out.println("Example: +4917077651234");
+				System.out.print("> ");
+				String phone = new Scanner(System.in).nextLine();
+				user.sendCodeToPhoneNumber(phone);
+				
+				System.out.println("Telegram sent you a code. Please enter it here.");
+				System.out.print("> ");
+				String code = new Scanner(System.in).nextLine();
+				user.verifyCode(code);
+				
+				if (user.isPasswordNeeded()) {
+					System.out.println("We also need your account password.");
+					System.out.print("> ");
+					String pw = new Scanner(System.in).nextLine();
+					user.verifyPassword(pw);
+				}
+				storage.setPrefix(user.getUser().getPhone());
+				
+				System.out.println("Next time, please run this tool with '--account " + user.getUser().getPhone() + " to use this account.");
+			}
+			
+			System.out.println("You are now signed in as " + user.getUserString());
+			
+			DownloadManager d = new DownloadManager(user);
+			d.downloadMessages();
+		} catch (RpcErrorException e) {
+			e.printStackTrace();
+		} catch (IOException e) {
+			e.printStackTrace();
+		} finally {
+			client.close();
+		}
+		System.out.println("----- EXIT -----");
+	}
+	
+	private void show_help() {
+		System.out.println("Valid options are:");
+		System.out.println("  --help                          Shows this help.");
+		System.out.println("  --account <x>                   Use account <x>.");
+		System.out.println("  --login                         Login to an existing telegram account.");
+		System.out.println("  --debug                         Show (lots of) debug information.");
+		System.out.println("  --list-accounts                 List all existing accounts");
+		
+		System.exit(0);
+	}
+	
+	private void list_accounts() {
+		System.out.println("List of available accounts:");
+		int count = 0;
+		File folder = new File(Config.FILE_BASE);
+		File[] files = folder.listFiles();
+		for (File f : files) {
+			if (f.isDirectory()) {
+				count++;
+				System.out.println("  " + f.getName());
+			}
+		}
+		if (count>0) {
+			System.out.println("Use '--acount <x>' to use one of those accounts.");
+		} else {
+			System.out.println("NO ACCOUNTS FOUND");
+			System.out.println("Use '--login' to login to a telegram account.");
+		}
+		System.exit(0);
+	}
+	
+	public static void show_error(String error) {
+		System.out.println("ERROR: " + error);
+		System.exit(1);
+	}
+	
+	private class CommandLineOptions {
+		public String account = null;
+		public boolean cmd_help = false;
+		public boolean cmd_login = false;
+		public boolean cmd_debug = false;
+		public boolean cmd_list_accounts = false;
+		
+		public CommandLineOptions(String[] args) {
+			String last_cmd = null;
+			
+			for (String arg : args) {
+				if (last_cmd != null) {
+					switch(last_cmd) {
+						case "--account": this.account=arg; break;
+					}
+					last_cmd = null;
+					continue;
+				}
+				
+				switch(arg) {
+					case "--account": last_cmd=arg; continue;
+					case "--help": this.cmd_help=true; break;
+					case "--login": this.cmd_login=true; break;
+					case "--debug": this.cmd_debug=true; break;
+					case "--list-accounts": this.cmd_list_accounts=true; break;
+					default: throw new RuntimeException("Unknown command " + arg);
+				}
+			}
+			if (last_cmd != null) {
+				CommandLineController.show_error("Command " + last_cmd + " had no parameter set.");
+			}
+		}
+	}
+}
diff --git a/src/main/java/de/fabianonline/telegram_backup/CommandLineRunner.java b/src/main/java/de/fabianonline/telegram_backup/CommandLineRunner.java
new file mode 100644
index 0000000..d57ce0f
--- /dev/null
+++ b/src/main/java/de/fabianonline/telegram_backup/CommandLineRunner.java
@@ -0,0 +1,9 @@
+package de.fabianonline.telegram_backup;
+
+import de.fabianonline.telegram_backup.CommandLineController;
+
+public class CommandLineRunner {
+	public static void main(String[] args) {
+		new CommandLineController(args);
+	}
+}
diff --git a/src/main/java/de/fabianonline/telegram_backup/Config.java b/src/main/java/de/fabianonline/telegram_backup/Config.java
index 75f2666..35636f4 100644
--- a/src/main/java/de/fabianonline/telegram_backup/Config.java
+++ b/src/main/java/de/fabianonline/telegram_backup/Config.java
@@ -9,9 +9,10 @@ class Config {
     public static final String APP_SYSVER = "1.0";
     public static final String APP_APPVER = "0.1";
     public static final String APP_LANG = "en";
-
-    public static final File FILE_AUTH_KEY = new File("auth.dat");
-    public static final File FILE_DC = new File("dc.dat");
-    public static final File FILE_SALT = new File("salt.dat");
+    
+    public static final String FILE_BASE = "data";
+    public static final String FILE_NAME_AUTH_KEY = "auth.dat";
+    public static final String FILE_NAME_DC = "dc.dat";
+    public static final String FILE_NAME_DB = "database.sqlite";
 }
 
diff --git a/src/main/java/de/fabianonline/telegram_backup/Database.java b/src/main/java/de/fabianonline/telegram_backup/Database.java
new file mode 100644
index 0000000..1e5e3ad
--- /dev/null
+++ b/src/main/java/de/fabianonline/telegram_backup/Database.java
@@ -0,0 +1,97 @@
+package de.fabianonline.telegram_backup;
+
+import com.github.badoualy.telegram.tl.api.TLMessage;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.Statement;
+import java.sql.SQLException;
+import java.sql.ResultSet;
+import java.io.File;
+
+import de.fabianonline.telegram_backup.UserManager;
+
+
+class Database {
+	private Connection conn;
+	private Statement stmt;
+	
+	public Database(UserManager user) {
+		try {
+			Class.forName("org.sqlite.JDBC");
+		} catch(ClassNotFoundException e) {
+			CommandLineController.show_error("Could not load jdbc-sqlite class.");
+		}
+		
+		String path = "jdbc:sqlite:" +
+			Config.FILE_BASE +
+			File.separatorChar +
+			user.getUser().getPhone() +
+			File.separatorChar +
+			Config.FILE_NAME_DB;
+		
+		try {
+			conn = DriverManager.getConnection(path);
+			stmt = conn.createStatement();
+		} catch (SQLException e) {
+			CommandLineController.show_error("Could not connect to SQLITE database.");
+		}
+		
+		this.init();
+	}
+	
+	private void init() {
+		try {
+			int version;
+			ResultSet rs = stmt.executeQuery("SELECT COUNT(*) FROM sqlite_master WHERE type='table' AND name='database_versions'");
+			rs.next();
+			if (rs.getInt(1)==0) {
+				version = 0;
+			} else {
+				rs.close();
+				rs = stmt.executeQuery("SELECT MAX(version) FROM database_versions");
+				rs.next();
+				version = rs.getInt(1);
+				rs.close();
+			}
+			System.out.println("Database version: " + version);
+			
+			if (version==0) {
+				stmt.executeUpdate("CREATE TABLE messages ("
+						+ "id INTEGER PRIMARY KEY ASC, "
+						+ "dialog_id INTEGER, "
+						+ "to_id INTEGER, "
+						+ "from_id INTEGER, "
+						+ "type TEXT, "
+						+ "text TEXT, "
+						+ "time TEXT, "
+						+ "has_media BOOLEAN, "
+						+ "data BLOB)");
+				stmt.executeUpdate("CREATE TABLE dialogs ("
+						+ "id INTEGER PRIMARY KEY ASC, "
+						+ "name TEXT, "
+						+ "type TEXT)");
+				stmt.executeUpdate("CREATE TABLE people ("
+						+ "id INTEGER PRIMARY KEY ASC, "
+						+ "name TEXT, "
+						+ "username TEXT, "
+						+ "type TEXT)");
+				stmt.executeUpdate("CREATE TABLE database_versions ("
+						+ "version INTEGER)");
+				stmt.executeUpdate("INSERT INTO database_versions (version) VALUES (1)");
+				version = 1;
+			}
+		} catch (SQLException e) {
+			System.out.println(e.getSQLState());
+			e.printStackTrace();
+		}
+	}
+	
+	public void save(TLMessage msg) {
+		/*BufferArrayOutputStream stream = new BufferArrayOutputStream();
+		msg.serializeBody(stream);
+		bytes[] = stream.toByteArray();
+		PreparedStatement ps = conn.prepareStatement(query);
+		ps.setBytes(x, bytes[]);*/
+	}
+}
diff --git a/src/main/java/de/fabianonline/telegram_backup/DownloadManager.java b/src/main/java/de/fabianonline/telegram_backup/DownloadManager.java
new file mode 100644
index 0000000..c1f78a3
--- /dev/null
+++ b/src/main/java/de/fabianonline/telegram_backup/DownloadManager.java
@@ -0,0 +1,18 @@
+package de.fabianonline.telegram_backup;
+
+import de.fabianonline.telegram_backup.UserManager;
+import de.fabianonline.telegram_backup.Database;
+
+class DownloadManager {
+	UserManager user;
+	Database db;
+	
+	public DownloadManager(UserManager u) {
+		this.user = u;
+		this.db = new Database(u);
+	}
+	
+	public void downloadMessages() {
+		System.out.println("downloading messages... not.");
+	}
+}
diff --git a/src/main/java/de/fabianonline/telegram_backup/Main.java b/src/main/java/de/fabianonline/telegram_backup/Main.java
deleted file mode 100644
index faf7f82..0000000
--- a/src/main/java/de/fabianonline/telegram_backup/Main.java
+++ /dev/null
@@ -1,60 +0,0 @@
-package de.fabianonline.telegram_backup;
-
-import com.github.badoualy.telegram.api.Kotlogram;
-import com.github.badoualy.telegram.api.TelegramApp;
-import com.github.badoualy.telegram.api.TelegramClient;
-import com.github.badoualy.telegram.tl.exception.RpcErrorException;
-
-import de.fabianonline.telegram_backup.Config;
-import de.fabianonline.telegram_backup.ApiStorage;
-import de.fabianonline.telegram_backup.UserManager;
-
-import java.io.File;
-import java.io.IOException;
-import java.util.Scanner;
-
-public class Main {
-	public static TelegramApp app = new TelegramApp(Config.APP_ID, Config.APP_HASH, Config.APP_MODEL, Config.APP_SYSVER, Config.APP_APPVER, Config.APP_LANG);
-	public static UserManager user = null;
-	
-	public static void main(String[] args) {
-		System.out.println("Hello World");
-		
-		Kotlogram.setDebugLogEnabled(true);
-		
-		TelegramClient client = Kotlogram.getDefaultClient(app, new ApiStorage());
-		
-		try {
-			user = new UserManager(client);
-			
-			if (!user.isLoggedIn()) {
-				System.out.println("Please enter your phone number in international format.");
-				System.out.println("Example: +4917077651234");
-				System.out.print("> ");
-				String phone = new Scanner(System.in).nextLine();
-				user.sendCodeToPhoneNumber(phone);
-				
-				System.out.println("Telegram sent you a code. Please enter it here.");
-				System.out.print("> ");
-				String code = new Scanner(System.in).nextLine();
-				user.verifyCode(code);
-				
-				if (user.isPasswordNeeded()) {
-					System.out.println("We also need your account password.");
-					System.out.print("> ");
-					String pw = new Scanner(System.in).nextLine();
-					user.verifyPassword(pw);
-				}
-			}
-			
-			System.out.println("You are now signed in as " + user.getUserString());
-		} catch (RpcErrorException e) {
-			e.printStackTrace();
-		} catch (IOException e) {
-			e.printStackTrace();
-		} finally {
-			client.close();
-		}
-		System.out.println("----- EXIT -----");
-	}
-}
diff --git a/src/main/java/de/fabianonline/telegram_backup/UserManager.java b/src/main/java/de/fabianonline/telegram_backup/UserManager.java
index 21de8e5..02d1b6e 100644
--- a/src/main/java/de/fabianonline/telegram_backup/UserManager.java
+++ b/src/main/java/de/fabianonline/telegram_backup/UserManager.java
@@ -89,4 +89,6 @@ class UserManager {
 		}
 		return sb.toString();
 	}
+	
+	public TLUser getUser() { return this.user; }
 }