This is a little larger than the usual maintenance release...it contains some new features for all the save scummers out there. 
Enjoy.
New in 1.3.6
All Platforms:
- Added the ability to backup and restore saved games for the currently monitored game by using the "Backup" and "Restore" buttons on the main window.
- This allows you to save scum while a game is running, without interrupting the current session.
- Read the Backup and Restore during Gameplay section of the manual for more details and recommendations when using this feature.
- This feature is disabled by default. Enable it in Settings -> Backup and Restore.
- Fixed issues that could cause the Ludusavi Manifest import to fail.
- Fixed a crash that could occur when cancelling detection and re-enabling while using the "Fast" detection speed.
- Changed how concurrent operations are handled.
- A backup, restore or import operation cannot be queued while another is currently in progress, a warning notification is now displayed if this occurs.
- Syncs triggered by another application and automatic backup restores can now execute while GBM is currently monitoring a session or paused while working in another window such as the Game Manager.
- Automatic backup restores may still fail if they happen to queue during another operation in progress.
- The "Esc" key can now be used to shutdown the app or hide the main window to the system tray, depending on the "User Interface" settings.
- Updated YamlDotNet to 13.1.1.
Windows:
- Added the ability to backup or restore saved games for the last played, selected or currently monitored game by using global hotkeys.
- This allows you to quickly backup or restore your save(s) without the need to switch to GBM.
- This feature is disabled by default, it can be configured in Settings -> Global Hotkeys and Settings -> Backup and Restore.
- This feature is not available in Linux.
- Added unique "Success" or "Failure" audio that will play when a backup or restore is triggered from a hotkey.
- Updated SQLite3 to 3.42.0.
- Updated 7-Zip to 23.01.
Linux:
- The main window can now be hidden to the system tray when closed.
- Uncheck "Exit when closing window" in "Main Window Options" of Settings -> User Interface to enable this feature.
- It can also be hidden automatically on startup by checking the "Start minimized" option in Settings -> Startup.
- GBM no longer needs to wait 60 seconds before automatically restoring new backups (if enabled) when the app starts.
Known Issues (Linux):
- The main window may not redraw correctly if resized after it's been restored from the system tray.
The entire version history of GBM releases is available at http://mikemaximus.github.io/gbm-web/versionhistory.html