Using a File Deploy Job, you can copy files and directories to target servers and
overwrite the corresponding files on those machines. Alternatively, you can copy
only those files and directories that meet criteria you specify, a process called a
synchronized push. If the files and directories on a target server satisfy your criteria, the
push replaces those files
You specify creitera like md5sum or permissions or last modified date etc
When deploying a file or directory, you can take precautions to back up the files that
So YES, backup will happen , meaning it will backup your files which will be overwritten. You can use suffix to suffix the backed up names of the files
During an Undo, this backed up files are restored.
Hope this helps.