应用内存大小占用Application memory size occupation

[Cinght520]

他在我的手机当中占用19gb，我想他应该太大了，我应该如何清理内存，或者是备份所有设置然后清空整个软件，并导入备份
It takes up 19 GB in my phone, I think it should be too big, how should I clean up the memory, or backup all the settings and then empty the whole software and import the backup.