Can I find a cache file to recover my PDF?

[Chun29724731r3jf]

When saving a PDF file, my laptop was powered off and the file was damaged. I opened this file with a HEX-viewer and found it was only comprised of '00'.
I want to know how this file was saved. Is there any cache file, or it's written directly from RAM to PDF file? If the latter is the case, I guess my file is over.
The verison of my acrobat PDF is Adobe Acrobat XI 11.0.20

[Amal.]

Hi @Chun29724731r3jf 

Hope you are doing well and sorry to hear that.

The Autosave feature guards against losing your work in case of a power failure by incrementally, and at regular intervals, saving file changes to a specified location. The original file is not modified. Instead, Acrobat creates an autosave file of changes, which includes all the changes you made to the open file since the last automatic save. The amount of new information that the autosave file contains depends on how frequently Acrobat saves the autosave file. If you set the autosave interval to 15 minutes, you could lose the last 14 minutes of your work if a problem occurs. Frequent automatic saving prevents loss of data, and is especially useful if you make extensive changes to a document, such as by adding comments.

You can apply autosave changes to the original files when you restart Acrobat. When you close, save manually, or revert to the last-saved version of a file, the autosave file is deleted.

For more info. please go through the help page https://helpx.adobe.com/acrobat/using/saving-pdfs.html

Note: Adobe Acrobat 11 is an EOL application, this feature is not supported with Acrobat 11.  For more information, please go through the help page https://helpx.adobe.com/acrobat/kb/end-of-support-acrobat-xi-reader-xi.html

Regards

Amal