不管你将 IntelliJ 装在什么地方，它都会在 C 盘的用户目录下创建 .IntelliJIdeaXX 目录，而且这个目录会随着时间增长到几个 G 那么大。这会占用C盘的空间，为了不占用C盘空间，可以更改配置，把idea配置文件放到其它分区中去。
如果用户目录和系统盘在一个分区，那系统盘分区可用空间就会变小，系统重装时，这个目录还会被删除。
修改intellij idea安装目录下 \bin\idea.properties文件，将所有的 ${user.home} 替换为自定义位置 （注意斜杠的方向）（注意要把#去掉，去掉#才会起作用）
Properties代码：
# Use ${idea.home} macro to specify location relative to IDE installation home.
# Use ${xxx} where xxx is any Java property (including defined in previous lines of this file) to refer to its value.
# Note for Windows users: please make sure you're using forward slashes (e.g. c:/idea/system).
#---------------------------------------------------------------------
# Uncomment this option if you want to customize path to IDE config folder. Make sure you're using forward slashes.
#---------------------------------------------------------------------
#打开confi的配置
# idea.config.path=${user.home}/config
#---------------------------------------------------------------------
# Uncomment this option if you want to customize path to IDE system folder. Make sure you're using forward slashes.
#---------------------------------------------------------------------
#打开system的配置
# idea.system.path=${user.home}/system
#---------------------------------------------------------------------
# Uncomment this option if you want to customize path to user installed plugins folder. Make sure you're using forward slashes.
#---------------------------------------------------------------------
#打开plugins的配置
# idea.plugins.path=${idea.config.path}/plugins
#---------------------------------------------------------------------
# Uncomment this option if you want to customize path to IDE logs folder. Make sure you're using forward slashes.
#---------------------------------------------------------------------
#打开log的配置
# idea.log.path=${idea.system.path}/log将idea.config.path和idea.system.path里面的所以${user.home}改成将要存放目录的位置，我这里修改为D:/Program/JetBrains，如下是修改后的结果：
#---------------------------------------------------------------------
# Uncomment this option if you want to customize path to IDE config folder. Make sure you're using forward slashes.
#---------------------------------------------------------------------
idea.config.path=D:/Program/JetBrains/.IntelliJIdea/config
#---------------------------------------------------------------------
# Uncomment this option if you want to customize path to IDE system folder. Make sure you're using forward slashes.
#---------------------------------------------------------------------
idea.system.path=D:/Program/JetBrains/.IntelliJIdea/system 接下来，重启IDEA工具就可以了。
同样按照上面的方法也可以修改DataGrip的缓存目录
