Generated file excel(.mhtml) corrupted while copying to folder in unix env

Hello,

I would like to check if anyone here experience the same scenario below?

OS: Red Hat Linux

I'm just copying a file to another folder to have a backup using shell script but sometimes it got corrupted.

Same as ftp-ing the file to window server and it will also got corrupted, I just want to run a VBA script to reduce file size because its too huge.

Any response is very much appreciated.

Many thanks in advance!
Alberto