docs: add cow notes for the plain compress_method

TISUnion · Dec 20, 2023 · daa16d2 · daa16d2
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diff --git a/docs/config.md b/docs/config.md
@@ -288,7 +288,7 @@ The method to compress files stored in a backup
 
 | Compress Method | Description                                                                                                                                                   | Speed | Compress rate |
 |-----------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------|-------|---------------|
-| `plain`         | No compression, copy the file directly                                                                                                                        | ★★★★★ | ☆             |
+| `plain`         | No compression, copy the file directly. Can utilize the copy-on-write technique if the file system supports that                                              | ★★★★★ | ☆             |
 | `gzip`          | The [gzip](https://docs.python.org/3/library/gzip.html) library based on [zlib](https://www.zlib.net/). The format same as a `.gz` file                       | ★★    | ★★★★          |
 | `lzma`          | The [LZMA](https://docs.python.org/3/library/lzma.html) algorithm. The same format as a `.xz` file. Provides the best compression, but the speed is very slow | ☆     | ★★★★★         |
 | `zstd`          | The [Zstandard](https://github.com/facebook/zstd) algorithm. A good balance between speed and compression rate. Recommend to  use                             | ★★★☆  | ★★★★          |

diff --git a/docs/config.zh.md b/docs/config.zh.md
@@ -288,7 +288,7 @@ Prime Backup 除了会保存 `world` 这个符号链接外，还会保存 `foo`
 
 | 压缩方法    | 描述                                                                                                    | 速度    | 压缩率   |
 |---------|-------------------------------------------------------------------------------------------------------|-------|-------|
-| `plain` | 无压缩，直接复制                                                                                              | ★★★★★ | ☆     |
+| `plain` | 无压缩，直接复制。若文件系统支持，将使用写时复制技术进行文件复制                                                                      | ★★★★★ | ☆     |
 | `gzip`  | 基于 [zlib](https://www.zlib.net/) 的 [gzip](https://docs.python.org/3/library/gzip.html) 库。`.gz` 文件同款格式 | ★★    | ★★★★  |
 | `lzma`  | [LZMA](https://docs.python.org/3/library/lzma.html) 算法。`.xz` 文件同款格式。提供最佳的压缩率，但是速度非常慢                  | ☆     | ★★★★★ |
 | `zstd`  | [Zstandard](https://github.com/facebook/zstd) 算法。一个优秀的压缩算法，在速度和压缩率间取得了较好的平衡。推荐使用                      | ★★★☆  | ★★★★  |