diff --git a/docs/h6.md b/docs/h6.md
index 2213e76..2591f15 100644
--- a/docs/h6.md
+++ b/docs/h6.md
@@ -293,12 +293,13 @@ Een mooi voorbeeld van een hoge tolerantie is het internet. Berichten op het int
 <div class="multicolumn">
 <div>
 
-![](./img/h6/toy-story-2-2.jpg)
+<img src="./img/h6/toy-story-2-2.jpg" height="800" />
 
 </div>
 <div>
 
-![](./img/h6/toy-story-2-1.png)
+<img src="./img/h6/toy-story-2-1.png" height="200" />
+<img src="./img/h6/toy-story-2-3.jpg" height="550" />
 
 </div>
 </div>
@@ -325,6 +326,10 @@ Notes:
 
 <img src="./img/h6/backup_survey.png" class="r-stretch" />
 
+Notes:
+
+-   https://www.backblaze.com/blog/2024-state-of-the-backup-security-incidents-and-data-loss-on-the-rise/
+
 ---
 
 ## De 3-2-1-regel
@@ -347,6 +352,10 @@ Notes:
 
 <img src="./img/h6/nas_cloud_backups.png" class="r-stretch" />
 
+Notes:
+
+-   Bv. https://www.backblaze.com/blog/a-tale-of-two-nas-setups-part-one-easy-off-site-backups/
+
 ---
 
 Voorbeeld:
@@ -492,6 +501,33 @@ Notes:
 
 ---
 
+<div class="multicolumn">
+<div>
+
+![](./img/h6/aws-bill-1.png)
+![](./img/h6/aws-bill-2.png)
+![](./img/h6/aws-bill-3.png)
+
+</div>
+<div>
+
+![](./img/h6/google-loss-1.png)
+![](./img/h6/google-loss-2.png)
+
+</div>
+</div>
+
+Notes:
+
+-   https://medium.com/@maciej.pocwierz/how-an-empty-s3-bucket-can-make-your-aws-bill-explode-934a383cb8b1
+-   https://www.reddit.com/r/aws/comments/qgr9jh/was_billed_60k_with_a_free_tier/
+-   https://www.reddit.com/r/aws/comments/lbqcos/my_forgotten_account_has_a_20000_bill_how_screwed/
+-   How one mistake increased my AWS bill 525,000x: https://www.youtube.com/watch?v=wR5FduIqGy0
+-   https://tweakers.net/nieuws/216070/google-probleem-met-verdwenen-drive-bestanden-ligt-aan-desktopapp.html
+-   https://arstechnica.com/gadgets/2024/05/google-cloud-accidentally-nukes-customer-account-causes-two-weeks-of-downtime/
+
+---
+
 ## Hoeveel back-ups bijhouden en hoe lang?
 
 -   Je houdt best **meerdere** back-ups over **langere tijd** bij
@@ -525,8 +561,12 @@ Notes:
 
 ## Test de back-ups!
 
--   "Is it really a backup if you haven't attempted to restore?"
--   "Untested backup == no backup"
+-   :warning: Test dat
+    -   De backups worden gemaakt
+    -   De data correct herstelt wordt van de backups
+
+> Is it really a backup if you haven't attempted to restore?  
+> Untested backup == no backup
 
 <img src="./img/h6/backup_failure.png" class="r-stretch" />
 
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