Esc > Save keeps up to ten campaigns in slots. When you save over a slot, its old save is kept as a .bak file. A save is written to a new file, read back, and only then put in place, so a failed save never damages the old one.

The game also saves itself at the end of every month, keeping the last three months (Autosave 1 is the newest). Continue on the title screen picks up the newest autosave.

A battle can be saved halfway: the save holds the battle's start and every move, and loading fights it again exactly to where it was.

Export to a file (at the end of the Save list) and Import from a file (at the end of the Load list) keep a campaign in a file of your choosing, for example to move it to another computer.

Saves are kept in %LOCALAPPDATA%\river_oath\saves on Windows and ~/.config/river_oath/saves/ on Linux, with the options in options.ini beside them. They are left alone when you upgrade or uninstall.

A save that is damaged, or made by a newer version, is refused with a message, and the campaign being played is left as it was.

The same ten slots and three autosaves, kept in the browser's own storage on your computer. They are not on the server, so they stay on that computer and that browser, and clearing the browser's site data deletes them. Export to a file downloads the campaign; Import from a file opens one.

The files are the same in both editions, so Export and Import move a campaign between the browser and the desktop. In the browser, Export is also the way to keep a copy that survives clearing the browser's data.

Multi-player games are kept on the server, not in your browser: see Multi-player games. An online game's world cannot be opened in the desktop edition.