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我和一个朋友聊起我们几十年前编写的 DOS POS 系统。它很粗糙，是用 Turbo Pascal 手写的，使用 DBF 文件，而且由于被盗版，竟然还在一些地方运行着。我们已经没有源代码了。没有安装盘。没有备份。这个软件的寿命比我们对它的记忆还要长。这让我意识到，“临时”工作往往比它的创造者活得更久，而源代码却消失了。你因为认为以后会备份而丢失的最重要的东西是什么？代码、数据、研究、艺术作品、配置文件，任何东西都可以。这次损失是否永久地改变了你处理备份的方式？

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A friend and I were talking about a DOS POS system we wrote decades ago. It was crude, handwritten using Turbo Pascal DBF files and somehow still running in a few places since it got pirated.We no longer have the source. No install disks. No backups. The software survived longer than our memory of it.It made me realize how often "temporary" work outlives its creators, while the source vanishes.What’s the most important thing you lost because you assumed you’d back it up later? Code, data, research, art, configs, anything.Did that loss permanently change how you handle backups?

问 HN：因为没有备份，你永远失去了什么？