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Cloud Sync

JELOS has built in support for multiple cloud sync options. These can be used to sync save files, games and other files between multiple devices.


Syncthing is a tool that lets you synchronize the contents of folders across multiple devices. It is different from cloud storage in that devices are updated directly with the latest changes from their peer(s) whenever they are online at the same time. Some things you can use it for with JELOS:

  • Keep your game library synchronized between your computer and JELOS device(s),
  • Keep all your handhelds synchronized (including those that run Android),
  • Copy savegames as they are created and seamlessly continue playing on another device,
  • Keep a copy of your configuration files for easier editing.


Setup on JELOS

  • Make sure you are connected to a WiFi network before continuing.
  • Go to "Network Settings" and set "Enable Syncthing" to "on". Make a note of your device's IP address, as well as the root password in the System Settings menu.
  • On a computer or mobile device in the same network, open a browser and point it to "http://a.b.c.d:8384" where "a.b.c.d" is the IP address of your JELOS device.
  • When prompted for a user name and password, enter "root" as user and the password you noted earlier.
  • You should now be directed to a configuration page running on your JELOS device - we'll come back to this shortly.

Setup on Peer(s)

Install Syncthing on the device or computer that you want to synchronize with your JELOS device. If your other device also runs JELOS, simply repeat the above steps. Otherwise go to to download Syncthing for your platform. You may also find it in your Linux distribution's package manager, the Android Play Store, etc. Generally it is not required to install the same version of Syncthing on all devices. You can synchronize a folder across any number of peers.

Connecting Folders

  1. Go to the web interface of your JELOS device (see above). Don't worry about notices about upgrading or the file system being read-only, nothing you can do. (Note: You can also go to the web interface of any of the peers, it'll work the same - but for this documentation it is assumed that you're on a JELOS device.)
  2. Under "Remote Devices", click "Add Remote Device". Enter the Device ID of the peer you want to synchronize with. If the remote is in the same network as your JELOS device the ID will be shown automatically. Otherwise, you'll find it in the remote's web interface by clicking "Actions" at the top and then "Show ID". Give the device a name if you like.
  3. In the "Folders" section, click "Add Folder". In the popup window that opens, set a label and specify the path on the device (e.g. /storage/roms). This is the folder you will be sharing with other peers.
  4. In the same popup window, go to the "Sharing" tab and select the remote device you just set up. Optionally, go to the "Ignore Patterns" tab and configure those. Click "Save" to close the window.
  5. On the remote's interface you should receive a popup that a new device wants to connect. Click "Add Device" and then "Save" to accept. It should now show up under "Remote Devices".
  6. Still on the remote, you should receive a new popup saying that the JELOS device wants to share a folder. Click "Add", then in the popup window, specify the path to an empty local folder to store the synchronized contents. Click "Save".
  7. The folder should now be copied from the JELOS device to the remote.

Adding more Peers

  • To share the folder with more peers, first follow step 2 on your JELOS device to add another remote.
  • Find the folder you want to add another peer to and click "Edit".
  • In the popup window, go to the "Sharing" tab. The new remote should appear as an option. Select it and then click "Save".
  • Follow steps 5 and 6 on the new remote to connect the folder.

Things to Keep in Mind

Syncthing is not a cloud storage

In order for devices to synchronize, they need to be online at the same time. Unless you have one peer that is always on, this is different from an online storage like Dropbox or Nextcloud. However, this behaviour can be emulated (no pun intended) by installing Syncthing on a cloud server or an always-on Raspberry Pi.

Syncthing is not a backup

Folders are synchronized with other peers immediately as they come online at the same time - this includes changes and deletions! Be sure to make regular backups of your folders.

Devices do not need to be on the same network

Syncthing uses relay servers to ensure communication between peers. This means that there does not need to be a direct connection between your devices, no port forwarding, etc - as soon as they are both online they will find each other and synchronize. Although file transfers are end-to-end encrypted when they are sent through relays, be aware of this if you plan on using Syncthing for anything more sensitive than your save files.

Using Syncthing for Saves/States

Using Syncthing for savegames is great because it allows you to seamlessly play a game across multiple handhelds, or even other devices. For example, you can play a game of Super Mario 64 on your RG353 while on the go, then launch the game on a RetroPie or PC running RetroArch and your save game will be transferred automatically to be continued on the big screen. However, this comes with a few caveats.

RetroArch differentiates between saves, i.e. the battery or memory card storage featured in the original game, and states, i.e. the save state feature that is part of the emulator. While saves are often compatible across different versions of RetroArch cores, states tend to break more frequently. This means that if you create states with two incompatible versions of an emulator and they are synchronized, you may lose one of them.

  • For maximum compatibility, make sure to use the same cores on all devices and update them at similar frequencies.
  • RetroArch uses two separate folders for saves and states. This makes it easy to choose whether you want to synchronize only saves, states, or both.
  • In the RetroArch settings under "Saving", you can tell RetroArch to sort saves and states into subfolders based on content directory or core name. It is highly recommended to make use of this to reduce the risk of accidentally overwriting an incompatible save or state.
  • Make regular backups of your save folders.

Synchronizing with Android

  • For Android-based handhelds people seem to be recommending the Syncthing-Fork from F-Droid.
  • Keeping Syncthing running in the background on Anroid may severely impact your battery life and reduce standby time. Check out these tips to help you balance battery life and synchronization times.
  • Using cross-platform versions of emulators is much more likely to introduce incompatibilities so be extra careful when syncing savegames.

Further Documentation

For any questions and advanced configuration, be sure to check out the full documentation at


Using Rclone is easy, however configuration must be performed manually before it will function correctly.

rclone.cfg is stored in /storage/.config/rclone/rclone.conf and can be copied from another device but only after the destination device has booted into Jelos (so copy to secondary sd, boot device, launch 351files, copy from there to proper path above)

Setup Rclone

Credentialed Access

To set up rclone, open an ssh connection to your handheld using PowerShell ssh, putty, or ssh on Linux and Mac. * Username: root (all lower case!) * Password: (To get the root password, press Start, then Select System Settings.) * Connection: (Your device, example RG552 or RG351MP.)

Example using PowerShell ssh, Linux, or macOS:

ssh root@RG552

Setting up Rclone

Now that you're connected you will need to configure Rclone. This process is menu driven, but also requires steps on your PC. To complete configuration of Rclone, run rclone config in your ssh session and then follow the provider documentation and headless configuration steps to configure it for your cloud provider of choice.

See detailed setup example below

Using Rclone

In JELOS you are able to mount your cloud drive like any other storage device, as long as you are network connected. To mount your cloud drive, press Start, select Network Settings, and then select the Mount Cloud Drive option. This drive is available on /storage/cloud by default, and is accessible from ssh and from 351Files. To mount the cloud drive over ssh use rclonectl mount to mount the drive and rclonectl unmount to unmount it.

Note: Mounting the cloud drive is not persistent, you will need to select it before use.

Using Cloud Backup and Restore

In the tools menu you will find two options, Cloud Backup, and Cloud Restore. These tools will back up or restore your save games and save states by connecting your cloud drive and copying them. These tools are configurable by editing /storage/.config/rsync.conf and /storage/.config/rsync-rules.conf.

Note: The cloud backup and restore tools are destructive, but they do not delete data by default. Deletes are left to the user to manage.


The rsync.conf configuration file contains parameters used by the cloud tools that provide the path for your cloud drive to be mounted, the path to sync the data from, the destination for the sync and rsync options for cloud backup and restore. The configuration is user editable, and the defaults are as follows:

### This is the path where your cloud volume is mounted.

### This is the path to your game folder on your cloud drive.

### This is the path we are backup up from.

### This allows changes to the rsync options for cloud_backup (pending stable release)
RSYNCOPTSBACKUP="-raiv --prune-empty-dirs"

### This allows changes to the rsync options for cloud_restore (pending stable release)


The rsync-rules.conf configuration file contains the pattern used by rsync to know which files to backup and restore. This file is user editable. The default settings are as follows:

# This is a required rule for subdirectory matching.
+ */

### Do not include BIOS.
- bios/**

### Retroarch saves
+ *.sav
+ *.srm
+ *.auto
+ *.state*

### This is a required rule to exclude all other file types.
- *

To create custom match rules, use - to exclude and + to include. Use caution as a mismatched rule can copy every single file from the source path or no files at all.

Detailed Example

This example configures rclone to use Dropbox

Rclone provide detailed examples for connecting to all supported cloud servers, including Rclone Dropbox example

Configure cloud backup connection on JELOS device using ssh

From the terminal command line type

rclone version

and press enter

Note the version number, which is required for a later step

Rclone version installed in JELOS

Now type

rclone config

and press enter

type n to create a new remote site

type in a name for the site (use a name without spaces), then press enter

rclone suggest using remote, but in this example the remote site is called rg503

don’t include spaces in the site’s name. Rclone does allow names that include spaces, but rsync will fail if a site name with spaces is used in the cloud backup script.

Type: rclone config

Choose from the list of cloud providers that is displayed. For Dropbox, type 12 and enter in this example

Select cloud provider

The next options displayed are slightly different from the Dropbox example on rclone website

For client_id and client_secret press enter and enter to skip, or read Rclone Dropbox example for details about setting up your own App ID (rclone App ID is shared with all rclone users by default)

Type n to skip editing the advanced config

Skip Client ID, secret and advanced config

For auto config, select n for remote or headless machine (i.e. JELOS device that doesn't have a web browser)

No auto-config for remote or headless machine

Instructions are provided explaining how to authorize the connection from the remote device to the cloud service

Device with web-browser is required for authorization

Install and run rclone on machine with a web-browser to authorize connection to cloud service

Download rclone on a device with a web-browser so rclone can use a web-page to authorize the connection by allowing you to login with your authorization credentials for the cloud service

Rclone download server

Download the same version of rclone as is installed on JELOS device, as noted above.

Use terminal window (e.g. CMD on Windows) to browse to rclone executable and run

rclone authorize dropbox

and press enter

Authorize dropbox for rclone

Rclone will launch a web page to enable login to the cloud service and authorization of the connection

Authorize dropbox for rclone

After successful authorization, the terminal window will display the authorization token that needs to be pasted into JELOS ssh

Copy authorization token

Copy the entire token

Update JELOS with authorization token

Paste authorization token into JELOS command prompt, then type y to confirm that the remote connection is correct

Paste authorization token into ssh

The connection is now configured and can be tested (q to quit rclone config)


rclone lsd rg503:

where rg503 is the name of the remote connection (rclone example names the remote connection as remote)

don't forget to add : to the name of remote connection

The names of the top-level folders within Dropbox cloud service will be displayed

Dropbox folder names are displayed