diff --git a/apache_status/python_modules/apache_status.py b/apache_status/python_modules/apache_status.py
index d718a92b..5d2ad522 100755
--- a/apache_status/python_modules/apache_status.py
+++ b/apache_status/python_modules/apache_status.py
@@ -7,6 +7,7 @@
 import urllib2
 import traceback
 import re
+import copy
 
 # global to store state for "total accesses"
 METRICS = {
@@ -14,7 +15,7 @@
     'data' : {}
 }
 
-LAST_METRICS = dict(METRICS)
+LAST_METRICS = copy.deepcopy(METRICS)
 METRICS_CACHE_MAX = 5
 
 #Metric prefix
@@ -106,7 +107,7 @@ def get_metrics():
                  traceback.print_exc()
 
 
-        LAST_METRICS = dict(METRICS)
+        LAST_METRICS = copy.deepcopy(METRICS)
         METRICS = {
             'time': time.time(),
             'data': metrics
diff --git a/blueeyes_service/python_modules/blueeyes_service.py b/blueeyes_service/python_modules/blueeyes_service.py
index 3b700eab..a8a11900 100755
--- a/blueeyes_service/python_modules/blueeyes_service.py
+++ b/blueeyes_service/python_modules/blueeyes_service.py
@@ -30,6 +30,7 @@
 import os
 import re
 import time
+import copy
 
 
 PARAMS = {
@@ -43,7 +44,7 @@
     'time' : 0,
     'data' : {}
 }
-LAST_METRICS = dict(METRICS)
+LAST_METRICS = copy.deepcopy(METRICS)
 METRICS_CACHE_TTL = 1
 
 
@@ -84,7 +85,7 @@ def get_metrics():
             metrics = {}
 
         # update cache
-        LAST_METRICS = dict(METRICS)
+        LAST_METRICS = copy.deepcopy(METRICS)
         METRICS = {
             'time': time.time(),
             'data': metrics
diff --git a/mongodb/python_modules/mongodb.py b/mongodb/python_modules/mongodb.py
index faee1d09..7ef34bed 100755
--- a/mongodb/python_modules/mongodb.py
+++ b/mongodb/python_modules/mongodb.py
@@ -31,7 +31,7 @@
 import socket
 import string
 import time
-
+import copy
 
 NAME_PREFIX = 'mongodb_'
 PARAMS = {
@@ -42,7 +42,7 @@
     'time' : 0,
     'data' : {}
 }
-LAST_METRICS = dict(METRICS)
+LAST_METRICS = copy.deepcopy(METRICS)
 METRICS_CACHE_TTL = 3
 
 
@@ -85,7 +85,7 @@ def get_metrics():
                 metrics = {}
 
         # update cache
-        LAST_METRICS = dict(METRICS)
+        LAST_METRICS = copy.deepcopy(METRICS)
         METRICS = {
             'time': time.time(),
             'data': metrics
diff --git a/network/conntrack/python_modules/conntrack.py b/network/conntrack/python_modules/conntrack.py
index 23598971..1fd04635 100644
--- a/network/conntrack/python_modules/conntrack.py
+++ b/network/conntrack/python_modules/conntrack.py
@@ -27,7 +27,7 @@
 
 import os
 import time
-
+import copy
 
 NAME_PREFIX = 'conntrack_'
 PARAMS = {
@@ -37,7 +37,7 @@
     'time' : 0,
     'data' : {}
 }
-LAST_METRICS = dict(METRICS)
+LAST_METRICS = copy.deepcopy(METRICS)
 METRICS_CACHE_MAX = 5
 
 def create_desc(skel, prop):
@@ -67,7 +67,7 @@ def get_metrics():
                 metrics[values[0]] = 0
 
         # update cache
-        LAST_METRICS = dict(METRICS)
+        LAST_METRICS = copy.deepcopy(METRICS)
         METRICS = {
             'time': time.time(),
             'data': metrics
diff --git a/network/multi_interface/python_modules/multi_interface.py b/network/multi_interface/python_modules/multi_interface.py
index 7fb6aca0..a7bf9bdf 100644
--- a/network/multi_interface/python_modules/multi_interface.py
+++ b/network/multi_interface/python_modules/multi_interface.py
@@ -2,6 +2,7 @@
 import time
 import sys
 import os
+import copy
 
 PARAMS = {}
 
@@ -11,7 +12,7 @@
     'time' : 0,
     'data' : {}
 }
-LAST_METRICS = dict(METRICS)
+LAST_METRICS = copy.deepcopy(METRICS)
 METRICS_CACHE_MAX = 5
 
 INTERFACES = []
@@ -153,7 +154,7 @@ def get_metrics():
                 metrics[dev_name] = re.split("\s+", a[1].lstrip())
 
         # update cache
-        LAST_METRICS = dict(METRICS)
+        LAST_METRICS = copy.deepcopy(METRICS)
         METRICS = {
             'time': time.time(),
             'data': metrics
diff --git a/system/cpu_stats/python_modules/cpu_stats.py b/system/cpu_stats/python_modules/cpu_stats.py
index 3f7e9f85..b34aa028 100644
--- a/system/cpu_stats/python_modules/cpu_stats.py
+++ b/system/cpu_stats/python_modules/cpu_stats.py
@@ -3,6 +3,7 @@
 import os
 import re
 import time
+import copy
 
 METRICS = {
     'time' : 0,
@@ -23,7 +24,7 @@
   'rcu' : 10
 }
 
-LAST_METRICS = dict(METRICS)
+LAST_METRICS = copy.deepcopy(METRICS)
 METRICS_CACHE_MAX = 5
 
 
@@ -53,7 +54,7 @@ def get_metrics():
             metrics[parts[0]] = list(parts[1:])
 
         # update cache
-        LAST_METRICS = dict(METRICS)
+        LAST_METRICS = copy.deepcopy(METRICS)
         METRICS = {
             'time': time.time(),
             'data': metrics
diff --git a/system/mem_fragmentation/python_modules/mem_fragmentation.py b/system/mem_fragmentation/python_modules/mem_fragmentation.py
index 33ccee70..36633860 100644
--- a/system/mem_fragmentation/python_modules/mem_fragmentation.py
+++ b/system/mem_fragmentation/python_modules/mem_fragmentation.py
@@ -1,6 +1,7 @@
 import sys
 import re
 import time
+import copy
 
 PARAMS = {}
 
@@ -15,7 +16,7 @@
 
 buddyinfo_file = "/proc/buddyinfo"
 
-LAST_METRICS = dict(METRICS)
+LAST_METRICS = copy.deepcopy(METRICS)
 METRICS_CACHE_MAX = 5
 
 stats_pos = {} 
@@ -82,7 +83,7 @@ def get_metrics():
 
 	file.close
         # update cache
-        LAST_METRICS = dict(METRICS)
+        LAST_METRICS = copy.deepcopy(METRICS)
         METRICS = {
             'time': time.time(),
             'data': values
diff --git a/system/vm_stats/python_modules/vm_stats.py b/system/vm_stats/python_modules/vm_stats.py
index 79b50066..3e0595b0 100644
--- a/system/vm_stats/python_modules/vm_stats.py
+++ b/system/vm_stats/python_modules/vm_stats.py
@@ -1,8 +1,7 @@
 import sys
-#import traceback
-#import os
 import re
 import time
+import copy
 
 PARAMS = {}
 
@@ -12,7 +11,7 @@
     'time' : 0,
     'data' : {}
 }
-LAST_METRICS = dict(METRICS)
+LAST_METRICS = copy.deepcopy(METRICS)
 METRICS_CACHE_MAX = 5
 
 ###############################################################################
@@ -47,7 +46,7 @@ def get_metrics():
             metrics[parts[0]] = parts[1]
 
         # update cache
-        LAST_METRICS = dict(METRICS)
+        LAST_METRICS = copy.deepcopy(METRICS)
         METRICS = {
             'time': time.time(),
             'data': metrics
diff --git a/tokyo_tyrant/python_modules/tokyo_tyrant.py b/tokyo_tyrant/python_modules/tokyo_tyrant.py
index 62844762..3cd7fb50 100755
--- a/tokyo_tyrant/python_modules/tokyo_tyrant.py
+++ b/tokyo_tyrant/python_modules/tokyo_tyrant.py
@@ -27,7 +27,7 @@
 
 import os
 import time
-
+import copy
 
 NAME_PREFIX = 'tokyo_tyrant_'
 PARAMS = {
@@ -37,7 +37,7 @@
     'time' : 0,
     'data' : {}
 }
-LAST_METRICS = dict(METRICS)
+LAST_METRICS = copy.deepcopy(METRICS)
 METRICS_CACHE_MAX = 1
 
 
@@ -61,7 +61,7 @@ def get_metrics():
                 metrics[values[0]] = values[1]
 
         # update cache
-        LAST_METRICS = dict(METRICS)
+        LAST_METRICS = copy.deepcopy(METRICS)
         METRICS = {
             'time': time.time(),
             'data': metrics
diff --git a/varnish/python_modules/varnish.py b/varnish/python_modules/varnish.py
index 7c4ca3b6..e84ef0d6 100755
--- a/varnish/python_modules/varnish.py
+++ b/varnish/python_modules/varnish.py
@@ -27,7 +27,7 @@
 
 import os
 import time
-
+import copy
 
 NAME_PREFIX = 'varnish_'
 PARAMS = {
@@ -37,7 +37,7 @@
     'time' : 0,
     'data' : {}
 }
-LAST_METRICS = dict(METRICS)
+LAST_METRICS = copy.deepcopy(METRICS)
 METRICS_CACHE_MAX = 5
 
 def create_desc(skel, prop):
@@ -67,7 +67,7 @@ def get_metrics():
                 metrics[values[0]] = 0
 
         # update cache
-        LAST_METRICS = dict(METRICS)
+        LAST_METRICS = copy.deepcopy(METRICS)
         METRICS = {
             'time': time.time(),
             'data': metrics