The toolbar Manage Backups button opens the Backup Manager. Use it to snapshot level files so you can roll back after experimenting in the script editor.
Backups cover everything under that level's folder in DATA/ENV/ for the current game install. They're stored under DATA/MODTOOLS/BACKUPS/. Global configs (ammo, alien settings, and so on) are separate — use Revert Configs for those.
The first time you open Backup Manager, OpenCAGE recommends creating a backup of all levels while they're still unmodified, so you always have a clean restore point.
Pick a level from the Level dropdown. It defaults to the level you have open (otherwise your last choice, or the frontend).
The create label shows how many files differ from the latest backup for that level — e.g. Create Backup (12 Changes). Each backup in the list has a name, date, and a details column (file count for the first backup, then how many files changed since the previous one).
Type a name, then click Backup Level Now.
If that level is open in the script editor, OpenCAGE asks whether to save it first. After the snapshot is written, you'll get a short confirmation.
Backup All Levels Now walks every level in the install and creates a snapshot for each. The first pass names them First backup; later full passes use Automated backup across all levels.
This can take a while — leave OpenCAGE open until it finishes. If a level is open in the script editor, you'll get the same save prompt first.
Select one backup in the list, then click Restore Selected Backup.
OpenCAGE closes the game if it's running, replaces the level folder with the backup, then confirms. If that level is open in the script editor, you're asked whether to reload it so the editor matches the restored files.
If restore fails, something else is likely locking files in the level folder — close the game, other tools, or anything else using those files, then try again.
Check the backups you want to remove (checkboxes, not just row selection), then click Delete Checked Backups. OpenCAGE asks for confirmation, deletes those restore points, and cleans up backup data that nothing else still references.
Restore and delete use different selection styles: restore needs a single selected row; delete uses the checked boxes.
Revert Configs opens a separate tool from the Backup Manager. It resets global game configs (ammo, alien configs, difficulty, behaviour trees, and so on) back to stock — not level ENV backups.
Each reset closes the game if it's running, then restores the matching vanilla files. Use this when config edits went wrong; use level backups when script / level file edits went wrong.
For editing those configs instead of resetting them, see the Configurations docs. For behaviour trees specifically, see the Behaviour Tree Editor guide (Reset Behaviour Trees restores the global BML).
