Warn to check backup

content/docs/tools/teddyCloud/flash-ca/esp32.md

@@ -8,6 +8,8 @@ description: ""
 With teddyCloud you can also write a new image with your custom CA and a DNS/IP so the box connects to teddyCloud.
 If you have a Fritzbox you can set it to tc.fritz.box (see CC3200 how to configure the hostname on your Fritzbox), if not set it to the IP of teddyCloud.
 
+Check, that your backup of your flash is okay and you were able to extract the certificates. 
+
 ![Finished reading the flash/hostname](/img/esp32_read_flash_finished_webui.png)
 
 ![Patchimage](/img/esp32_patch_image_webui.png)