Do you mean quick saves? If so...
Taken from
http://www.larian.com/Site/english/divinity/english.htmlDownload the patch, then increase the number of quicksave slots like this:
Quicksaves now alternate between 1 and the MaxQuickSaveAmount setting in config.lcl which by default is at 2 but which can be increased to any number if you want a number of sequential quicksaves. To increase the setting – open the file config.lcl in the folder where you installed Divine Divinity, and add the line MaxQuickSaveAmount # with # being the maximum amount of quicksaves you want.Don't forget to press return after typing the new line, or it won't work
If you really mean autosaves, sorry - no idea
