Why am I seeing a storage warning?

Glean saves your Events both in the cloud and on your computer. This means your session is not interrupted if you go offline, and you can come back and continue to work on your Events without an internet connection.  

You will see the Critical Storage warning if Glean detects an issue which may prevent it from saving data locally: 

Image showing the Critical Storage issue warning message

There are 3 reasons you may see a storage warning:


Your device is low on disk space.


You are trying to use Glean in a private browsing mode ('Incognito Mode' in Chrome)


The option to "delete cookies after you close your browser" is enabled.

The troubleshooting guides below will help you identify what is triggering the storage warning, and what action you should take.

You should take action before continuing to use Glean, to ensure none of your data is lost.

You do not need to delete your existing Glean Events

Deleting Events from Glean will also delete them from the cloud, and your Events will be irretrievably lost.


Is your device running out of storage space?

If you seeing this warning message and the browser settings detailed below don't apply, it may be that your device is almost out of storage space.
The pop-up message will give an estimate of how much storage you have available, and how much recording time this might be in Glean.

Image showing the Storage warning message

These are estimates only - you should take action as soon as possible to free up space so Glean can continue saving your Events correctly.

You can free up disk space by removing all your locally stored Events (you'll still have everything in the Cloud); there's more information in this article: Freeing up space

Need some pointers on freeing up disk space?

These external articles may help:


Free up drive space in Windows 10: https://support.microsoft.com/en-us/help/12425/windows-10-free-up-drive-space


How to free up storage space on your Mac: https://support.apple.com/en-us/HT206996


Are you trying to use Glean in private browsing mode?

Chrome's Incognito icon.

Private browsing modes (such as Incognito Mode in Chrome) severely limit the storage available to web applications.
This could prevent your Glean recordings from being saved and uploaded properly. 

When you close a private browser window, all site data is deleted. This could lead to an irretrievable loss of your Event data.

You will likely see the warning message as soon as you open Glean in private browsing mode.
If this is the case, simply re-open Glean in a normal browser window.

If you have made any changes in Glean before the warning appears, you should ensure that your changes have synced to the cloud before closing your private browser window. 

For more information, see our article on why you should avoid using Glean in private browsing mode.


Is the option to automatically delete cookies enabled?

The Critical Storage Issue message is triggered if you have told your browser to delete site data when you exit.

This option may prevent Glean from working properly, since it limits the storage available to Glean, and automatically deletes cookies and site data when you exit the browser. This means you'll be signed out of Glean, and any unsynced changes to your Events may be lost.

Guest Mode - If you're using Chrome or Edge in 'Guest Mode' then this setting is automatically applied.

For Chrome Users:

  1. Open your browser on your computer.
  2. Enter the following URL in the address bar and hit Enter:


  3. This will bring up the On-device Site Data section.
  4. Check that the "Allow sites to save data on your device" is selected


add app.glean.co under the sites allowed to save data on your device

Image showing Chromes Setting page about On-device site data

For Edge Users

  1. Open your browser on your computer.
  2. Enter the following URL in the address bar and hit Enter:


  3. This will bring up the Privacy section.
  4. Check that Cookies and other site data is NOT selected


    add app.glean.co under the 'Don't Clear' list of sites allowed

Image showing Chrome's settings page about cookies and other site date

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