对一切数据进行冗余备份，至少要有一个物理硬盘备份和一个云端备份。每个备份都要多于一个。想想要是你弄丢了所有数据、照片、笔记，得花多少钱来找回它们？与遗憾相比，备份很便宜。

"The only thing to do with good advice is to pass it on. It is never of any use to oneself."

Psychology should focus on how the mind functions to solve practical problems, not just its abstract structure.