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.