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diff --git a/Chap9ProjBackupToZip.py b/Chap9ProjBackupToZip.py
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+++ b/Chap9ProjBackupToZip.py
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+#!/usr/bin/env python3
+
+# Chapter 9 Project Backup to Zip
+# Copies a folder recursively into a zip file and names it incrementally.
+
+import os
+import zipfile
+
+def backupToZip(folder):
+    folder = os.path.abspath(folder)
+
+    number = 1
+    while True:
+        zipFilename = os.path.basename(folder) + '_' + str(number) + '.zip'
+        if not os.path.exists(zipFilename):
+            break
+        number = number + 1
+
+    print('Creating %s...' % (zipFilename))
+    backupZip = zipfile.ZipFile(zipFilename, 'w')
+
+    for foldername, subfolders, filenames in os.walk(folder):
+        print('Adding files in ' + foldername + '...')
+        backupZip.write(foldername)
+        for filename in filenames:
+            newBase = os.path.basename(folder) + '_'
+            if filename.startswith(newBase) and filename.endswith('.zip'):
+                continue
+            backupZip.write(os.path.join(foldername, filename))
+    
+    backupZip.close()
+    print('Done')
+
+
+backupToZip('/Users/mlotspaih/Documents/waffle')