is a specialized data-management mechanism used by developers to protect player progression and handle branching narrative paths. Unlike traditional linear save states that permanently overwrite data, a reversible save architecture allows a system to roll back choices, restore corrupted milestones, and manage complex state tracking without completely destroying the user's history.
encryption technology. It allows users to create a "YoSafe" (a hidden virtual drive) or encrypt individual files. Reversible Encryption
The most reliable method for achieving reversibility is storing player actions as a sequence of commands rather than saving raw object properties. Action Process State Result Player buys an item for 50 gold. Execute() subtracts 50 gold, adds item to inventory. Logging System appends action to the Egis ledger. The command history logs both the change and its inverse. Reversal Player triggers a rollback. Undo() adds 50 gold, removes item from inventory. Snapshot Delta Compression egis reversible game save
FM players talk about "Save Scumming" to win the Champions League. The Egis method takes it further. Imagine managing a club for 10 seasons, then wanting to see if a different youth academy strategy would have worked. You branch the save. One branch exists on your internal drive (Season 10), the other branch on the Egis drive (Season 5 branch). Truly reversible timelines.
Could someone explain what does "Rollback" mean? : r/Guiltygear It allows users to create a "YoSafe" (a
Building systems that can automatically upgrade save files to work with newer versions of the game engine. Key Features of Egis/Project Eris Saves
True reversibility requires platform diversity. By syncing a local save with a cloud backup, you protect against hardware failure. If your console or PC dies, your progress remains shielded in the cloud. How to Implement Reversible Saving Manually Execute() subtracts 50 gold, adds item to inventory
For large open-world games where tracking individual commands is too performance-heavy, delta snapshotting is used. The engine takes a master snapshot at a safe zone (e.g., entering a town). As the player explores, the game writes miniature bitmask files containing only changed coordinates, broken environmental props, and updated quest flags. Reversing the save simply drops the recent delta files and reloads the master snapshot. Overcoming Data Corruption and Sync Errors