diff --git a/config b/onedrive.conf
similarity index 100%
rename from config
rename to onedrive.conf
diff --git a/src/config.d b/src/config.d
index 021caf5e..a8cc1d66 100644
--- a/src/config.d
+++ b/src/config.d
@@ -2,69 +2,47 @@ import std.file, std.regex, std.stdio;
 
 struct Config
 {
-	private string filename;
 	private string[string] values;
 
-	this(string filename)
+	this(string[] filenames...)
 	{
-		this.filename = filename;
+		foreach (filename; filenames) {
+			load(filename);
+		}
 	}
 
-	string get(string key, string def = null)
+	string get(string key)
 	{
 		import core.exception;
 		try {
 			return values[key];
 		} catch (RangeError e) {
-			if (def) return def;
 			throw new Exception("Missing config value: " ~ key);
 		}
 	}
 
-	void set(string key, string value)
-	{
-		values[key] = value;
-	}
-
-	void load()
-	{
-		values = null;
-		auto file = File(filename, "r");
-		auto r = regex("(?:^\\s*)(\\w+)(?:\\s*=\\s*\")(.*)(?:\"\\s*$)");
-		foreach (line; file.byLine()) {
-			auto c = matchFirst(line, r);
-			if (!c.empty) {
-				c.popFront(); // skip the whole match
-				string key = c.front.dup;
-				c.popFront();
-				values[key] = c.front.dup;
-			} else {
-				writeln("Malformed config line: ", line);
-			}
-		}
-	}
-
-	void save()
+	private void load(string filename)
 	{
 		if (exists(filename)) {
-			string bkpFilename = filename ~ "~";
-			rename(filename, bkpFilename);
-		}
-		auto file = File(filename, "w");
-		foreach (key, value; values) {
-			file.writeln(key, " = \"", value, "\"");
+			auto file = File(filename, "r");
+			auto r = regex("(?:^\\s*)(\\w+)(?:\\s*=\\s*\")(.*)(?:\"\\s*$)");
+			foreach (line; file.byLine()) {
+				auto c = line.matchFirst(r);
+				if (!c.empty) {
+					c.popFront(); // skip the whole match
+					string key = c.front.dup;
+					c.popFront();
+					values[key] = c.front.dup;
+				} else {
+					writeln("Malformed config line: ", line);
+				}
+			}
 		}
 	}
 }
 
 unittest
 {
-	auto cfg = Config(tempDir() ~ "/test.conf");
-	cfg.set("test1", "1");
-	cfg.set("test2", "2");
-	cfg.set("test1", "3");
-	cfg.save();
-	cfg.load();
-	assert(cfg.get("test1") == "3");
-	assert(cfg.get("test2") == "2");
+	auto cfg = Config("empty", "onedrive.conf");
+	assert(cfg.get("sync_dir") == "~/OneDrive");
 }
diff --git a/src/main.d b/src/main.d
index 858415d8..80a8d771 100644
--- a/src/main.d
+++ b/src/main.d
@@ -28,7 +28,9 @@ void main(string[] args)
 	}
 
 	string configDirName = expandTilde(environment.get("XDG_CONFIG_HOME", "~/.config")) ~ "/onedrive";
-	string configFilePath = configDirName ~ "/config";
+	string configFile1Path = "/etc/onedrive.conf";
+	string configFile2Path = "/usr/local/etc/onedrive.conf";
+	string configFile3Path = configDirName ~ "/config";
 	string refreshTokenFilePath = configDirName ~ "/refresh_token";
 	string statusTokenFilePath = configDirName ~ "/status_token";
 	string databaseFilePath = configDirName ~ "/items.db";
@@ -40,8 +42,7 @@ void main(string[] args)
 	}
 
 	if (verbose) writeln("Loading config ...");
-	auto cfg = config.Config(configFilePath);
-	cfg.load();
+	auto cfg = config.Config(configFile1Path, configFile2Path, configFile3Path);
 
 	if (verbose) writeln("Initializing the OneDrive API ...");
 	auto onedrive = new OneDriveApi(cfg, verbose);
diff --git a/src/monitor.d b/src/monitor.d
index 9ebe15f7..49edd830 100644
--- a/src/monitor.d
+++ b/src/monitor.d
@@ -40,8 +40,8 @@ struct Monitor
 	void init(Config cfg, bool verbose)
 	{
 		this.verbose = verbose;
-		skipDir = wild2regex(cfg.get("skip_dir", ""));
-		skipFile = wild2regex(cfg.get("skip_file", ""));
+		skipDir = wild2regex(cfg.get("skip_dir"));
+		skipFile = wild2regex(cfg.get("skip_file"));
 		fd = inotify_init();
 		if (fd == -1) throw new MonitorException("inotify_init failed");
 		if (!buffer) buffer = new void[4096];
diff --git a/src/sync.d b/src/sync.d
index f85088f9..12bc21e6 100644
--- a/src/sync.d
+++ b/src/sync.d
@@ -69,8 +69,8 @@ final class SyncEngine
 		this.onedrive = onedrive;
 		this.itemdb = itemdb;
 		this.verbose = verbose;
-		skipDir = wild2regex(cfg.get("skip_dir", ""));
-		skipFile = wild2regex(cfg.get("skip_file", ""));
+		skipDir = wild2regex(cfg.get("skip_dir"));
+		skipFile = wild2regex(cfg.get("skip_file"));
 	}
 
 	void setStatusToken(string statusToken)