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Before changing a Steam Deck theme, CSS, sounds, layout, or performance plug-in, make two backups: a local archive and a second copy on another device or a supported cloud service. First record every installed Decky Loader plug-in and its settings, then use each plug-in’s export feature when available. In Desktop Mode, with Steam closed, copy the Decky and homebrew data plus plug-in-created configuration into a clearly named folder. Keep both copies until the customized interface has survived a restart and your recovery test.
This approach matters because Decky Loader is more than a theme switcher. The SteamDeckHomebrew Decky Loader README describes it as a homebrew plug-in launcher that can stylize menus, change system sounds, adjust screen saturation, and alter additional system settings. A backup therefore needs to cover loader and plug-in data, not only one CSS file.
What a Decky backup needs to contain
Decky Loader is a homebrew plug-in launcher for Steam Deck. Its plug-ins can change the appearance of menus, sounds, saturation, performance controls, and other system behavior. A UI customization can therefore involve several kinds of data at once:
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- The list of installed plug-ins, including each plug-in’s version and update channel.
- Plug-in preferences such as toggles, profiles, layout choices, performance values, sound selections, and display adjustments.
- Custom themes, CSS, artwork, sound files, or other assets you added.
- Loader and homebrew plug-in files that a clean reinstall might not restore in exactly the same state.
- Configuration files created by an individual plug-in.
There is no documented universal settings file that contains every Decky plug-in’s data. Plug-ins can store information differently, and uninstalling a plug-in may leave files behind. Treat the backup as a collection of the relevant directories and plug-in exports rather than assuming one file or one folder is sufficient.
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No authoritative source publishes a universal success rate, size estimate, or other numeric statistic for Decky backups. The dependable protection is procedural: export what the plug-in supports, archive the remaining data broadly, and keep a second copy away from the Deck.
Choose a backup method before you customize
The safest plan combines methods instead of choosing only one. A plug-in export is usually the cleanest way to preserve settings that the plug-in explicitly supports, while a manual archive covers files you do not know about. Local removable storage gives you a fast offline recovery path; another computer or cloud copy protects against loss, corruption, or a failed Deck storage device.
| Method | Strength | Limitation | Best use |
|---|---|---|---|
| Plug-in export | Uses the plug-in’s supported format and can make restoration cleaner. | Only covers data the plug-in exposes; not every plug-in has an export function. | Settings, profiles, or presets offered in a plug-in’s own menu. |
| Manual archive | Broad coverage of loader, homebrew, and unknown plug-in-created files. | Requires careful copying and may include files that are not obvious to identify. | The baseline backup made before any UI change. |
| Local removable storage | Fast, offline, and available even when the Deck has no network connection. | Can be lost, damaged, or connected to the same incident as the Deck. | A portable SSD or microSD card used as the first archive destination. |
| Another computer or cloud | Off-device protection if the Deck or removable media fails. | Needs network access for cloud recovery and depends on the service account remaining available. | The second copy required for resilient recovery. |
The Decky Ludusavi guide recommends making a local backup first and then adding cloud backup. Its named cloud destinations are Google Drive, OneDrive, and Dropbox. The guide also identifies the Decky Ludusavi plug-in as the official successor from the same developer, with versioning and cleaner maintenance. Use it when its supported backup scope matches your installed plug-ins, but retain a separate manual archive for files it does not cover.
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Gather storage for two copies
Prepare local removable storage with enough free space for the archive and your exported files. A portable SSD or microSD card is suitable for the local copy. Also identify a second computer or a supported cloud account. Do not treat two folders on the Deck itself as two backups; both would be lost if the Deck storage failed or was reset.
Use a date-based archive name
Create a folder named with the date and purpose, such as SteamDeck-UI-backup-2026-10-19. Keep exports, the manual archive, and a plain-text inventory in that folder. A date in the name prevents a later backup from being mistaken for the one that matches a particular theme or plug-in version.
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Record the current state before touching anything
Write down the SteamOS version, the Decky Loader version if shown, and the plug-in version and channel for every installed plug-in. Include whether a plug-in came from a stable or other update channel. This inventory is the reference you need if an update changes compatibility or if a plug-in must be reinstalled one at a time.
Step 1: inventory plug-ins and customization choices in Gaming Mode
- Start in Gaming Mode and open Decky from the Quick Access menu.
- List every installed plug-in. For each one, record its displayed name, version, and channel.
- Open each plug-in’s settings and record non-default choices. Include custom theme names, CSS selections, sound choices, layout changes, saturation adjustments, performance limits, profiles, and any setting that changes system behavior.
- Note where you obtained any custom asset and its original filename. Do not rely on remembering a theme’s name after the UI has been altered.
This inventory is not a substitute for the files, but it gives you a recovery map. If the interface becomes unusable, you can identify the newest change and reinstall or restore the correct plug-in without guessing.
Step 2: export settings from every plug-in that supports it
- Remain in Gaming Mode and open the settings page for the first plug-in in your inventory.
- Look for an action labelled Export, Backup, Save profile, or a similar plug-in-specific command. The exact label and location vary by plug-in.
- Export the settings and save the resulting file inside your dated archive folder. If the plug-in asks for a location, use a folder whose name includes the plug-in name.
- Repeat for every plug-in. If no export or backup action exists, mark that plug-in as “manual archive only” in the inventory.
- Open each exported file, where practical, to confirm that it exists and has a non-zero size. Do not edit the file unless the plug-in’s documentation requires it.
Export functions are valuable because they use a format the plug-in understands. They are not universal: one plug-in’s export does not capture another plug-in’s files, and the absence of an export button does not mean the plug-in has no persistent data.
Step 3: make the manual archive in Desktop Mode
Close Steam before copying
- Switch to Desktop Mode from the Steam power menu.
- Close the Steam client completely before copying Decky or homebrew data. A running client or plug-in can write settings while you are creating the archive.
- Connect the portable SSD or microSD card and open the file manager.
Copy the relevant data broadly
The available guidance does not define one universal path for every Decky plug-in. Do not assume that a single documented directory contains all settings. Instead, copy the Decky and homebrew plug-in data relevant to your installation, together with any configuration directories and custom assets created by the plug-ins in your inventory.
- Locate the Decky and homebrew data on the Deck using the paths described by the individual plug-in documentation when such details are provided.
- Copy the relevant directories wholesale into a subfolder such as
SteamDeck-UI-backup-2026-10-19/manual-archive. Preserving the directory structure makes a later restore less error-prone. - Include plug-in-created configuration and asset directories, not only files whose names contain “theme” or “CSS.” Performance, sound, display, and layout plug-ins can keep their data separately.
- Copy your exported plug-in files into clearly named subfolders, for example
exports/PluginName. - Copy the inventory text file into the archive root.
When a plug-in’s own documentation specifies a path, follow that documentation. When it does not, broad directory copying is safer than trying to predict which individual files matter. Avoid deleting or moving the source while making the backup; create a copy first.
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Preserve evidence of what you copied
Add a short text note listing the folders copied, the date, the SteamOS and plug-in versions, and any plug-in that could not be exported. This note is useful after a factory reset, when the original directory structure may no longer be visible and you need to decide which data to restore first.
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Step 4: create and verify the second copy
- Eject the removable storage safely after the local archive finishes.
- Copy the complete dated archive to another computer or to a supported cloud destination such as Google Drive, OneDrive, or Dropbox.
- Check that the second copy contains the inventory, every export, and the manual-archive directory. Do not assume a cloud upload completed just because it started.
- Keep the local removable copy separate from the Deck. Store it where it will not be accidentally reformatted during a later SteamOS recovery operation.
Use the two copies as independent recovery points. If one copy is incomplete, corrupted, or accidentally overwritten, the other should remain untouched. The local-first, cloud-afterward order follows the Decky Ludusavi guide and also gives you a usable offline copy before you begin customization.
Step 5: test that the archive is usable
A backup that exists but cannot be identified is difficult to restore. Before changing the UI, perform these checks:
- Open the archive on the removable drive and confirm that the dated folder contains the inventory and exported files.
- Compare the number of exported plug-ins with the number marked as having an export function.
- Open a copy of the inventory on the second device or cloud service.
- Confirm that the manual archive includes the directories you intended to copy, not only shortcuts or empty folders.
- Keep the original archive unchanged. If you later make a second backup after customization, give it a new date and leave the pre-customization copy intact.
This is a verification of completeness, not a promise that every plug-in can be restored automatically. Because plug-ins differ, a restore may still require reinstalling a plug-in and importing its export through that plug-in’s own settings.
Step 6: customize only after both copies exist
- Leave the dated archive on the removable drive and confirm that the off-device copy is available.
- Install or change one CSS, theme, sound, layout, performance, or system-setting plug-in at a time.
- After each change, note the plug-in and the setting in your inventory. This creates a clear rollback point.
- Avoid changing several unrelated plug-ins before restarting. If something breaks, changing one item at a time makes the newest cause easier to identify.
Decky Loader can alter more than visual styling, so treat a performance or system-setting plug-in with the same care as a theme. Keep the original archive until the customized configuration has passed the post-change checks.
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Step 7: check the Deck after customization
- Restart Steam after the change.
- Open the Quick Access menu and confirm that the Decky menu loads.
- Visit every screen you customized, including menus, overlays, sounds, and any plug-in that changes performance or system settings.
- Check that the plug-in list still shows the expected versions and channels.
- Test the settings that matter during normal use, such as a performance profile or display adjustment, rather than checking only whether the theme appears.
If the Deck remains stable, make a new dated backup of the working customized state while preserving the original pre-customization archive.
How to recover when the UI breaks
Disable the most recent change first
- Open the Decky Quick Access menu if it is still usable.
- Disable, reload, update, or remove the most recently changed plug-in. The Decky update guidance describes these individual plug-in actions.
- Restart Steam and check the affected screen again.
- If the problem remains, reverse the next-most-recent change rather than removing every plug-in at once.
Removing a plug-in may not delete every file it created. That is why the manual archive and the plug-in exports remain necessary even when uninstalling appears to fix the interface.
Restore the saved archive
- Close Steam and switch to Desktop Mode.
- Use the dated archive to restore the relevant Decky, homebrew, plug-in, and configuration data, preserving the original directory structure.
- Reinstall a plug-in when necessary, then use its own import or restore function with the exported file.
- Restart Steam and test the Quick Access menu and customized screens.
Restore only the data needed for the affected plug-in first. A staged restore makes it easier to identify a conflicting file or incompatible plug-in version.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Recovery after a SteamOS update
A SteamOS update can change compatibility without deleting your archive. Before updating, retain the dated copies and inventory. After the update, open Decky and check plug-ins individually. Update, reload, or remove a plug-in one at a time if it fails.
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Recovery after a factory reset
A factory reset removes the Deck’s local environment, so the off-device copy is essential. After the reset:
- Complete the Steam Deck setup and enter Desktop Mode.
- Install Decky Loader using the current supported procedure for your Deck.
- Use your inventory to reinstall the required plug-ins, matching versions or channels where practical.
- Import each plug-in export through that plug-in’s settings.
- Restore the manual archive’s relevant directories only after the loader and plug-ins are present.
- Restart Steam and verify the Quick Access menu, screens, sounds, and system-setting plug-ins.
Do not copy every old file blindly if a plug-in’s current documentation calls for a different location or format. The inventory and per-plug-in instructions tell you what to restore, while the broad archive preserves a fallback for files that have no export feature.
Common mistakes and their fixes
Backing up only the theme file
A theme or CSS file does not represent sound, layout, performance, saturation, or other plug-in settings. Repeat the inventory and manual-archive steps, including plug-in-created configuration.
Assuming one settings file covers every plug-in
No universal file is documented. Use each plug-in’s export function and copy the relevant directories wholesale.
Copying while Steam is running
Close Steam before the Desktop Mode copy. If settings change during the copy, repeat the archive after closing the client.
Keeping both copies on the Deck
Move the second copy to another computer or supported cloud service. Two folders on the same internal storage do not protect against a reset or storage failure.
Deleting the original after a successful-looking restore
Keep the pre-customization archive until the customized setup has passed a restart and functional check. Create a new dated archive instead of overwriting the old one.
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Removing a plug-in and assuming it is gone
Uninstallation can leave files behind. If a problem persists, restore the known archive or remove the remaining data according to the plug-in’s documentation rather than repeatedly reinstalling without a backup.
Quick Recap
A compact checklist
- Open Decky in Gaming Mode.
- Record every plug-in, version, channel, and customization.
- Export settings from every plug-in that offers export or backup.
- Create a dated archive folder.
- Switch to Desktop Mode and close Steam.
- Copy Decky, homebrew, plug-in, and plug-in-created configuration data broadly, following plug-in documentation for path details.
- Save the inventory and exports inside the archive.
- Copy the archive to a portable SSD or microSD card.
- Copy it again to another computer or Google Drive, OneDrive, or Dropbox.
- Verify both copies before installing or changing UI plug-ins.
- Change one plug-in at a time and test after restarting Steam.
- If the UI fails, disable or remove the newest change, then restore the archive.
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