Create a .zip, clearing the archive attribute of each file zipped (i.e. Incremental Backup).

How to create a .zip archive such that each file zipped will have it's archive file attribute cleared.

Download Chilkat Ruby Library

require 'chilkat'

zip = Chilkat::CkZip.new()

#  Any string unlocks the component for the 1st 30-days.
success = zip.UnlockComponent("Anything for 30-day trial")
if (success != true)
    print zip.lastErrorText() + "\n"
    exit
end

success = zip.NewZip("test.zip")
if (success != true)
    print zip.lastErrorText() + "\n"
    exit
end

#  Tell the component to clear each file's archive attribute
#  when zipping.
zip.put_ClearArchiveAttribute(true)

#  Append a directory tree.
#  Notice that the archiveOnly flag is set to true.  This
#  means that only files with the "File is ready for archiving" bit
#  set will be included.  (In Windows Explorer, right-click a file
#  and select Properties.  Then click the Advanced button.  You'll
#  see the "File is ready for archiving" checkbox.
#  This becomes automatically checked whenever a file is modified (or created).
#  The AppendFilesEx method will only add files ready for
#  archiving, and the WriteZipAndClose method will clear the
#  archive attribute for each file zipped.  The result is that
#  each time you run this program, only the modified files are zipped.
recurse = true
archiveOnly = true
includeHidden = true
includeSystem = true
saveExtraPath = false
zip.AppendFilesEx("c:/temp/abc123/*",recurse,saveExtraPath,archiveOnly,includeHidden,includeSystem)

success = zip.WriteZipAndClose()
if (success != true)
    print zip.lastErrorText() + "\n"
    exit
end

print "Zip Created!" + "\n"