This tool comes to replace the "Auto Save" function in Adobe Acrobat or Reader. Unlike that function, which generates temporary save files that can't be directly opened, this tool will perform a full automatic save of the current file each X amount of time (specified by the user).
Note that only the current file will be saved, though, and that the tool will stop working when all files are closed. Due to these limitations I'm offering it for free!
How to use it:
After installing the script open a file and then go to Tools - Add-On Tools ad you'll see these two buttons:
Clicking the first button ("Start Full Auto Save") will prompt you to enter the time in minutes between each save:
This can also be a fraction, for example, entering "0.1" will cause the file to save every 6 seconds.
Once you've done that the currently viewed file will be automatically saved at those intervals.
If the file has never been saved before (for example, if it's a temporary file one), you'll be first prompted to perform a Full Save on it manually. After which, the tool will be able to automatically save it.
Clicking the second button ("Stop Auto Full Save") will stop the Full Auto Save from running any further.
The script can be downloaded from here, and as always it comes with installation instructions.
If you find this tool useful and would like to donate, it's always appreciated!