How-To: Breaking It Down by Specific Files/FoldersI would recommend doing this after you have your Sims 3 folder safely backed up.
If you need/want to break it down even further than that. You just save the following folders and files:
-- To copy over the folders and files, right-click on one at a time and select copy and paste into your new Sims 3 folder.
Folders: -
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DCBackup - for this file = ccmerged.package - Files related to the installed .Sims3Pack files.
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DCCache - Contains all installed Custom Content/Exchange/Store items that you installed through the Launcher.
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Downloads - Items to be installed
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Exports - Files you export from the Game via CAS or Edit Town and will have and will be in .Sims3Pack format.
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Installed Worlds - Custom or Store Towns you have installed.
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Library - Sims and lots that you've installed.
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Mods - Mods and custom content
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Recorded Videos - Videos taken in-game using the V key.
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SavedSims - Saved Sims that are in the SimBin
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Saves - Game Saves - Each folder within the Saves folder is a single saved game.
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Screenshots - Photos taken in-game using the C key.
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WorldCaches - Cache files for your installed custom and Store towns.
Files: -
Options.ini - Game and Graphics Options
userPresets.package - Saved colors, patterns and textures
The other files and folders not mentioned here will auto-regenerate.
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✽ Important Note: ✽** If you're having issues with some store or custom content not working correctly. Leave out your DCCache folder and reinstall both your store and custom content. So that the game can create new files for this content in the DCCache folder.
If you don't, you may run into the same issue of the store or custom content not working. Due to the files not being refreshed.
If having problems with custom content and mods in .package file format, see the troubleshooting tips post linked below:
Sims 3 - How-To: Fix Problems with Mods/CC
https://www.carls-sims-4-guide.com/forum/index.php?topic=31759.msg506010#msg506010Create a New Game (How-To)
http://www.carls-sims-4-guide.com/forum/index.php?topic=20732.msg401813#msg401813Sims 3 Factory Reset (What & Howto) - Aka Create a new Sims 3 Folder
https://www.carls-sims-4-guide.com/forum/index.php?topic=20732.msg401814#msg401814