feat(cli): add portable data backup and restore

docs/cli/backup.mdx

@@ -0,0 +1,51 @@
+---
+title: Backup and Restore
+description: Export and restore CowAgent configuration and agent workspace data
+---
+
+CowAgent can create a portable local archive for migration or disaster recovery.
+
+## Create a backup
+
+```bash
+cow backup
+cow backup --output /safe/location/cow-backup.zip
+```
+
+The archive contains:
+
+- `config.json`
+- Agent persona and user files such as `AGENT.md`, `USER.md`, and `MEMORY.md`
+- Daily memory, session history, knowledge, custom skills, and scheduled tasks in the configured workspace
+- Legacy `user_datas.pkl`, when present
+
+Transient `tmp/` data, caches, Git metadata, and symbolic links are skipped. The
+archive is written with owner-only permissions where the operating system
+supports them.
+
+<Warning>
+  A backup may contain API keys, conversation history, and other personal data.
+  Store and transfer it as a secret. The ZIP file is not encrypted.
+</Warning>
+
+## Restore a backup
+
+Stop CowAgent before restoring:
+
+```bash
+cow stop
+cow restore /safe/location/cow-backup.zip
+```
+
+Use `--workspace` to migrate workspace files to a different location:
+
+```bash
+cow restore cow-backup.zip --workspace ~/cow-restored
+```
+
+Restore validates the archive format and paths before writing anything. It
+overwrites matching files but does not delete unrelated files already present
+at the destination. When current CowAgent data exists, the command first
+creates a `cow-pre-restore-*.zip` rollback archive beside the selected backup.
+
+For unattended scripts, pass `--yes` to acknowledge overwrites.

docs/cli/index.mdx

@@ -44,6 +44,10 @@ Memory & Knowledge:
   memory    Memory distillation (dream)
   knowledge View knowledge base stats and structure
 
+Data portability:
+  backup    Back up config and agent workspace
+  restore   Restore a CowAgent backup
+
 Others:
   help      Show this help message
   version   Show version
@@ -90,6 +94,7 @@ In the Web console or any connected channel, type `/` to see command suggestions
 | start / stop / restart | ✓ | ✗ |
 | update | ✓ | ✗ |
 | install-browser | ✓ | ✗ |
+| backup / restore | ✓ | ✗ |
 
 <Note>
   `context` only shows a hint in the terminal to use it in chat. `config` is only available in chat.

docs/docs.json

@@ -246,6 +246,7 @@
                   "cli/process",
                   "cli/skill",
                   "cli/memory-knowledge",
+                  "cli/backup",
                   "cli/general"
                 ]
               }
@@ -473,6 +474,7 @@
                   "zh/cli/process",
                   "zh/cli/skill",
                   "zh/cli/memory-knowledge",
+                  "zh/cli/backup",
                   "zh/cli/general"
                 ]
               }

docs/zh/cli/backup.mdx

@@ -0,0 +1,45 @@
+---
+title: 备份与恢复
+description: 导出和恢复 CowAgent 配置及 Agent 工作区数据
+---
+
+CowAgent 可以生成便携的本地归档，用于设备迁移或灾难恢复。
+
+## 创建备份
+
+```bash
+cow backup
+cow backup --output /safe/location/cow-backup.zip
+```
+
+归档包含：
+
+- `config.json`
+- `AGENT.md`、`USER.md`、`MEMORY.md` 等 Agent 人格和用户文件
+- 工作区内的每日记忆、会话历史、知识库、自定义技能和定时任务
+- 旧版 `user_datas.pkl`（如存在）
+
+临时 `tmp/` 数据、缓存、Git 元数据和符号链接不会写入归档。在操作系统支持的情况下，归档文件权限会限制为仅当前用户可读写。
+
+<Warning>
+  备份中可能含有 API 密钥、对话历史及其他个人数据，应按密钥文件保存和传输。ZIP 文件本身没有加密。
+</Warning>
+
+## 恢复备份
+
+恢复前先停止 CowAgent：
+
+```bash
+cow stop
+cow restore /safe/location/cow-backup.zip
+```
+
+迁移到不同工作区时，可以显式指定路径：
+
+```bash
+cow restore cow-backup.zip --workspace ~/cow-restored
+```
+
+恢复命令会在写入前校验归档格式和所有路径。它会覆盖同名文件，但不会删除目标目录中无关的现有文件。如果检测到当前 CowAgent 数据，会先在所选归档旁创建 `cow-pre-restore-*.zip` 回滚备份。
+
+无人值守脚本可传入 `--yes` 确认覆盖。

docs/zh/cli/index.mdx

@@ -44,6 +44,10 @@ Memory & Knowledge:
   memory    Memory distillation (dream)
   knowledge View knowledge base stats and structure
 
+Data portability:
+  backup    Back up config and agent workspace
+  restore   Restore a CowAgent backup
+
 Others:
   help      Show this help message
   version   Show version
@@ -92,6 +96,7 @@ Others:
 | start / stop / restart | ✓ | ✗ |
 | update | ✓ | ✗ |
 | install-browser | ✓ | ✗ |
+| backup / restore | ✓ | ✗ |
 
 <Note>
   `context` 在终端中仅提示到对话中使用。`config` 仅支持在对话中修改。