doc: add warning for ignored data (#83)

* doc: add warning for ignored data

* fix

Author: alex3236

docs/config.md

@@ -285,6 +285,12 @@ Changelog:
 
     Deprecated since v1.8.0. Use [ignore_patterns](#ignore_patterns) instead
 
+!!! danger
+
+    Files matched by `ignored_files` are also not considered during restore.  
+    After the restore, only those files that were backed up will exist in the target folders.  
+    Only use this option for useless files.
+
 A list of file / directory names to be ignored during backup
 
 If the name string starts with `*`, then it will ignore files with name ending with specific string, 
@@ -297,6 +303,12 @@ e.g. `temp*`  makes all files starts with `temp` be ignored, like `tempfile`
 
 #### ignore_patterns
 
+!!! danger
+
+    Files matched by `ignore_patterns` are also not considered during restore.  
+    After the restore, only those files that were backed up will exist in the target folders.  
+    Only use this option for useless files.
+
 A list of [gitignore flavor](http://git-scm.com/docs/gitignore) patterns for matching files / directories to be excluded during the backup
 
 The root path for the pattern matching is [source_root](#source_root).

docs/config.zh.md

@@ -285,6 +285,12 @@ Prime Backup 在创建备份时的操作时序如下：
 
     于 v1.8.0 弃用。请使用 [ignore_patterns](#ignore_patterns)
 
+!!! danger
+
+    `ignored_files` 匹配的文件在回档时不会被保留。  
+    回档后，目标文件夹中只存在已备份的内容。  
+    仅对无用数据使用此选项。
+
 在备份时忽略的文件名列表
 
 若文件名字符串以 `*` 开头，则将忽略以指定字符串结尾的文件，
@@ -297,6 +303,12 @@ Prime Backup 在创建备份时的操作时序如下：
 
 #### ignore_patterns
 
+!!! danger
+
+    `ignore_patterns` 匹配的文件在回档时不会被保留。  
+    回档后，目标文件夹中只存在已备份的内容。  
+    仅对无用数据使用此选项。
+
 一个 [gitignore 风格](http://git-scm.com/docs/gitignore) 的模板串列表，用于在创建备份的过程中匹配并忽略指定的文件 / 文件夹
 
 模板串匹配时的根路径是 [source_root](#source_root)。