many important data in my pdf

I have many files on my pc. And sometimes I have to make backup to external HDD. Today I have made it and on 90% the process has interrupted. I have continued it till the end. But after I tried to opened one of my .pdf files and it opened without many important changes.

 

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The cases then nothing can't solve your issue, to open or to repair .pdf document, then take a look at especial instrument unlike to restore corrupted pdf file

The article or guide you may call as you want contains useful information - Troubleshoot PDF printing in Acrobat and Reader

This is the source of manual below: How can I fix/repair a corrupted PDF file? - IT Answers

Ghostscript will repair your corrupted PDF automatically… if it can open it in the first place (that is, if it is not damaged beyond repair). But afterwards you’ll still need to double-check the result…

On Windows, try this one:

gswin32c.exe ^

-o repaired.pdf ^

-sDEVICE=pdfwrite ^

-dPDFSETTINGS=/prepress ^

corrupted.pdf

 

try to use pdf converter

 

I have many smportant pdf data in my PC too, espeically png files which I need to convert on pdf. In the past I used different pdf apps but now I prefer to use online pdf editor. It is convenient in use and it takes few minutes to convert png to pdf. Follow the instruction on
https://pdfmovavi.com/convert-png-to-pdf