An easier way to compress the saves on Mac is to highlight the two files, left click and click \"Compress 2 Items\". A .zip file named Archive.zip will appear: left click on this and click \"Get Info\". Under the \"Name & Extension\" section, click the box containing Archive.sav and change .zip to .sav. You will be prompted for confirmation on changing the extension.
Rollback is an integral part of the Ren'Py engine, and exists for a good reason. If you find, however, that you must keep the player from rolling back too far, you can use the renpy.block_rollback function. It will keep the players from scrolling past that certain point.
No. Ren'Py does not export any saved games or persistent data when it compiles your script. You do not need to delete your own saves to release a game, unless you redirected your saved game location to be your \"game\" folder. In that case, you should find and delete the \"saves\" folder and delete it. If it doesn't exist in your game folder, then you're fine.