From 2f86a17516ee33a348b7bf4c73e61d8cb81ef2d3 Mon Sep 17 00:00:00 2001
From: YeonGyu-Kim <code.yeon.gyu@gmail.com>
Date: Wed, 8 Apr 2026 13:26:27 +0900
Subject: [PATCH] feat(installer): add config backup utility for safe upgrades

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
---
 src/cli/config-manager/backup-config.ts | 32 +++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 src/cli/config-manager/backup-config.ts

diff --git a/src/cli/config-manager/backup-config.ts b/src/cli/config-manager/backup-config.ts
new file mode 100644
index 000000000..682c5dd55
--- /dev/null
+++ b/src/cli/config-manager/backup-config.ts
@@ -0,0 +1,32 @@
+import { copyFileSync, existsSync, mkdirSync } from "node:fs"
+import { dirname } from "node:path"
+
+export interface BackupResult {
+  success: boolean
+  backupPath?: string
+  error?: string
+}
+
+export function backupConfigFile(configPath: string): BackupResult {
+  if (!existsSync(configPath)) {
+    return { success: true }
+  }
+
+  const timestamp = new Date().toISOString().replace(/[:.]/g, "-")
+  const backupPath = `${configPath}.backup-${timestamp}`
+
+  try {
+    const dir = dirname(backupPath)
+    if (!existsSync(dir)) {
+      mkdirSync(dir, { recursive: true })
+    }
+
+    copyFileSync(configPath, backupPath)
+    return { success: true, backupPath }
+  } catch (err) {
+    return {
+      success: false,
+      error: err instanceof Error ? err.message : "Failed to create backup",
+    }
+  }
+}