.bak文件是AutoCAD在保存時自動創(chuàng)建的備份，用於恢復(fù)意外覆蓋或損壞的圖紙。 1. 它實(shí)質(zhì)上是重命名為.bak的.dwg文件，僅保留上次保存前的版本；2. 可通過改回.dwg擴(kuò)展名或直接在AutoCAD中選擇所有文件類型打開；3. 若需關(guān)閉此功能可在選項中取消“每次保存均創(chuàng)建備份副本”；4. 建議定期復(fù)制.bak文件以增強(qiáng)數(shù)據(jù)保護(hù)。

If you've ever worked with AutoCAD and noticed a .bak file showing up alongside your drawing, you might have wondered what it's for and whether you can use it. The short answer is: a .bak file in AutoCAD is an automatic backup of your drawing that gets created when you save the original file. It's there as a safety net in case something goes wrong.

Here's how to understand and work with .bak files effectively:

What exactly is a .bak file?

When you save a .dwg file in AutoCAD, the program automatically renames the previous version of the file to a .bak extension. This means if you're working on "project.dwg" and save it, AutoCAD will create a backup named "project.bak". This file contains the state of the drawing before the most recent save.

It's not a separate format — it's essentially another .dwg file with a different extension. That's why if you rename it back to .dwg, you can open it just like any other drawing.

Why does AutoCAD create .bak files?

AutoCAD creates .bak files as a recovery option. If your drawing becomes corrupted or you accidentally overwrite something important, having a .bak file gives you a way to go back to the previous version.

This is especially useful when:

• You're making major changes and want a fallback
• Your system crashes during a session
• You notice corruption after saving

Just keep in mind that .bak files are overwritten every time you save, so they only preserve the last saved version before your current one.

How do I open a .bak file?

Opening a .bak file is straightforward. Since it's basically a .dwg file, all you need to do is change the file extension from .bak to .dwg. Here's how:

• Locate the .bak file in File Explorer
• Right-click the file and choose Rename
• Change the extension from .bak to .dwg (you may get a warning about changing extensions — confirm that you want to proceed)
• Double-click the renamed file to open it in AutoCAD

Alternatively, you can open it directly in AutoCAD without renaming:

• Launch AutoCAD
• Go to File > Open
• In the file type dropdown, select All Files ( . )
• Browse to the .bak file and select it
• Click Open

How to manage or disable .bak files (if needed)

If you find .bak files cluttering your folders and don't see the need for them, you can turn off this feature by adjusting AutoCAD's settings:

• Type OPTIONS in the command line
• Go to the Open and Save tab
• Under the File Safety Precautions section, uncheck Create Backup Copy With Each Save
• Click OK

Keep in mind that disabling this removes a layer of protection, so only do it if you have another backup strategy in place.

On the flip side, if you want to ensure these backups are preserved more reliably, consider setting up a batch script or scheduled task to copy and store .bak files periodically.

基本上就這些。 Bak 文件本身不復(fù)雜，但很容易被忽略或誤刪。只要理解它是AutoCAD 為你創(chuàng)建的臨時備份，就知道它在關(guān)鍵時刻能派上用場了。

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