---
title: Storage Management
description: View saved projects, delete individual or multiple projects, check browser storage usage, and configure automatic backups in MIDAS.
---

# Storage Management {#storage-management}

MIDAS saves projects to your browser's storage. The Storage Management screen lets you view and delete saved projects, and check how much storage is in use.

## Open the Storage Management Screen {#open-the-storage-management-screen}

In the top-right of the launcher screen header, click the rightmost of the three icons—the storage icon, which looks like a panel with horizontal lines. The Storage Management screen opens. Click the **Back** button in the top-left corner to return to the launcher.

## View Saved Projects {#view-saved-projects}

The summary at the top of the screen shows the total number of saved projects and their combined size.

The table below lists each project by name and file size. Project files are Gzip-compressed when saved, and the displayed size is the actual storage consumption.

![Storage Management screen showing project count and total size summary at the top, a project list table in the middle, and the Danger Zone at the bottom](../shared/images/storage-management-overview.webp)

## Delete Projects {#delete-projects}

Deleted projects cannot be recovered. Export important projects as [MDS files](mds-file-format) before deleting. To export, open the project and run **File** > **Export Project...** in the project screen.

All delete operations show a confirmation dialog. Full Application Reset requires an additional confirmation step.

### Delete a Single Project {#delete-a-single-project}

Click the **X** button on the project's row in the project list. A confirmation dialog appears. Click **Delete** to confirm.

### Delete Multiple Projects {#delete-multiple-projects}

1. Select projects using the checkboxes. Use **Select All** to select all projects
2. Click **Delete Selected**
3. Click **Delete** in the confirmation dialog to remove the selected projects

## Backup Folder {#backup-folder}

You can automatically back up projects to a local folder outside the browser. If you select a folder synced with a cloud storage service such as OneDrive or Dropbox, your projects become accessible from other devices.

This feature is available only in Chromium-based browsers (Chrome, Edge, etc.). It is not available in Firefox or Safari.

### Configure backup {#configure-backup}

From the menu bar, select **Help** > **Settings...**, then open the **Backup** tab and click **Choose Folder...** to select a backup destination. After setup, each time you save a project, a copy of the MDS file is written to that folder. Saving the same project overwrites the previous backup.

To stop backups, click **Disconnect**. Files already in the folder are not deleted.

### Open on another device {#open-on-another-device}

The first time you use a backup on another device, open the MDS file from the backup folder with **Open File**. The project is automatically saved to the browser.

Once a project has been saved to the browser, configuring the same backup folder lets MIDAS show a dialog when you open that project if the folder contains a file newer than the last backup made from this PC, so you can choose which version to open.

### Browser support {#backup-browser-support}

This feature uses the File System Access API[^1] and is available only in Chromium-based browsers (Chrome, Edge, etc.). In Firefox and Safari, the setting appears in Settings but is disabled. If backup is not available, export MDS files manually via **File** > **Export Project...**.

## Danger Zone {#danger-zone}

The Danger Zone at the bottom of the screen contains bulk data deletion operations. MIDAS stores your project data, signing keys, settings, and backup settings in browser storage. See [Privacy and Security](privacy-security#data-storage) for details on storage locations.

### Clear All Projects {#clear-all-projects}

Deletes all saved projects. Your signing keys, settings, and backup settings are not affected by this operation and are kept.

### Full Application Reset {#full-application-reset}

Deletes all MIDAS data: project data, signing keys, settings, and backup settings. Requires two-step confirmation.

Before running a reset, back up your signing keys using the steps in [Managing Signing Keys](trusted-keys). Signing keys are used to verify authorship and detect tampering in exported MDS files, so without a backup you will no longer be able to sign exports with your previous key.

After reset, MIDAS returns to its initial state as if opened for the first time. Signing keys and backup folder settings are also deleted by this operation. Files in the backup folder are not deleted, but the folder setting is lost, so after the reset you will need to select the folder again in the **Backup** tab under **Help** > **Settings...**.

### Comparison of Delete Operations {#comparison-of-delete-operations}

| Operation | Projects | Signing keys | Settings | Backup settings |
|-----------|:---:|:---:|:---:|:---:|
| Clear All Projects | Deleted | Kept | Kept | Kept |
| Full Application Reset | Deleted | Deleted | Deleted | Deleted |

## Browser Storage Limitations {#browser-storage-limitations}

MIDAS data is stored in browser storage scoped to the `app.midas-app.org` origin.

- **Capacity**: The browser sets a storage quota per origin. The quota varies by browser and available disk space. Check current usage in the Storage Management summary. When the quota is exceeded, saving a project fails with an error. Delete unneeded projects to free up space
- **Data isolation**: Other sites and browser profiles cannot access your data
- **Data persistence**: When you save a project, MIDAS requests persistent storage from the browser. If granted, the browser will not automatically evict your data even when storage is under pressure. However, clearing site data for `app.midas-app.org` in your browser settings deletes all MIDAS data. Clearing only cookies or cache does not affect MIDAS data

## See also {#see-also}

- **[Project Management](project-management)** - Manage resources within a project
- **[MDS Files](mds-file-format)** - Export and file format for projects
- **[Managing Signing Keys](trusted-keys)** - Back up signing keys before Full Application Reset
- **[Privacy and Security](privacy-security)** - Data storage and security details

[^1]: [File System Access API | MDN](https://developer.mozilla.org/en-US/docs/Web/API/File_System_Access_API) - A web API for reading and writing files on the user's local file system