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
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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.
Sims 3 Factory Reset (What & Howto)
https://www.carls-sims-4-guide.com/forum/index.php?topic=20732.msg401814#msg401814