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Intro:
As Simmers, we love to create, and as creators we love to NOT see our creations utterly destroyed by ill-timed hard drive crashes or viruses.
In order to protect our creations, the smartest thing a Simmer can do is create backups often. The best and easiest way to do this is to copy the entire Electronic ArtsThe Sims 3 folder from your Documents and place it on an external storage device. This way, you can always copy the folder back into your Documents after a fresh install and continue your game right where you left off.
Unfortunately, sometimes the game's folder can grow well over the size of your average storage device. At this point, it becomes useful to go through the folder and pick and choose which files and folders are important to you and which ones can be safely disposed of for space. In the process of separating my essential files from the garbage, I came up with the following guide.
First off, there are multiple files in the Electronic ArtsThe Sims 3 folder itself. If removed, default versions of these files will automatically generate the next time you boot the game, so most of them are safe to exclude from your backup. However, two of these files may be important to you:
* userpresets.package: If you've created and saved any custom patterns in Create-a-Style, this file will exist and contain them, and you may want to back it up. If you've created no custom patterns, this file won't exist.
* Options.ini: this file contains your game preferences (such as your graphic and sound settings). If this file is missing, the game will simply create a new one the next time you play, and you'll just have to readjust your settings back to however you like them.
Apart from userpresets.package and Options.ini, none of the loose files in this folder are irreplaceable; the game will re-create them if it can't find them.
Saves -- Your most important folder.
The Saves subfolder contains your saved games. Always save this folder. Each saved game contains all of the data that is likely most important to you: the Sims you've created, the Lots they live on, the neighborhood they live in, their relationships with each other.. pretty much everything that matters.
InstalledWorlds, DCCache & Mods -- Your downloaded content.
InstalledWorlds contains worlds you've downloaded, such as Riverview, Barnacle Bay, or any custom neighborhoods created with Create-a-World. You can always download EA's worlds from the official site so it's not 100% necessary to back up (although it's a good idea to just so you don't have to download it again), but if you have any CAW worlds that you enjoy, you should back up this folder to avoid having to find and download them again, or discover that they're no longer available.
Important note: if you try to play a saved game in a world that isn't installed, the game will delete that saved game. So make sure your worlds are installed before trying to play.
DCCache contains any content you've downloaded and installed from The Store. These items can also be downloaded from your Purchase History page on the official site, but if you don't want to go through the hassle of downloading everything all over again, you should back up this folder. (Also, you may have downloaded items that for one reason or another are no longer available, such as the 2009 Toyota Prius or the Dr. Pepper promotional items. Backing up this folder will ensure that you still have access to those items.)
As for the Mods folders: if you downloaded any mods or custom content and went through the steps to install them, then this folder will exist and contain them, and you'll want to back it up. If you don't have any mods or custom content, then you can ignore this folder. Actually, you won't even have to because it won't exist.
Library & SavedSims -- The creations in your bins.
The Library folder contains any Households or Lots you've saved to your Library (the bin that appears at the bottom of the screen in Edit Town mode). This folder also contains Households and Lots you've downloaded and installed from The Exchange. Similarly, SavedSims contains any Sims you've saved to your Create-a-Sim bin or downloaded and installed from The Exchange. If any of those creations/downloads are important or irreplaceable to you, you should back up these folders.
Screenshots & Recorded Videos -- Your pictures and videos.
Screenshots contains pictures you've taken in-game, and Recorded Videos contains videos you've captured in-game. These folders can get humongous if you take a lot of pictures/video, so you may want to consider backing them up separately. In my case, I had 8 GB of screenshots, so I burnt them to an appropriately-sized disc and deleted them from my hard drive so that I never have to deal with them again when performing my regular backup.
DCBackup -- One important file plus several hundred megabytes of questionable worth.
There is one important file in the DCBackup folder called cc.merged. If it exists, you'll want to keep it, otherwise any premium content you've downloaded from The Store may not work properly.
Also in DCBackup are many large package files with long, garbled-up names. These are not entirely necessary to keep unless you tend to upload Sims with custom content to The Exchange. The game uses these files to attach the custom content to your uploaded Sims, and if the files aren't present, this process simply won't happen, and other Simmers won't see those items when they download your Sims. If you don't care at all about that, you can safely delete these package files and it won't affect your game at all. It'll also save you several hundred megabytes worth of space.
Downloads, Exports & Custom Music -- Disposable folders.
The Downloads folder contains the original package files for your downloaded content. When you install these package files, the launcher writes their content to one of several files in DCCache, where it becomes ready to use in-game. Once the content is written to DCCache, the purpose of the original package file is complete, and it no longer becomes necessary to keep. But you may optionally want to back it up, in the event that you need to reinstall everything (like if a bad EA update corrupts your game) and don't want to re-download your Store items.
Exports contains any content you've uploaded to The Exchange. This content can normally be found either in your game or in your Studio, thus this folder can safely be excluded from your backup if you so choose.
Custom Music: unless you put your own music in this folder, it's probably full of a bunch of songs you don't like that the game will keep regenerating anyway if you delete them.
Note: There are several folders I didn't go into detail about because they don't contain anything important when it comes to backing up one's creations. CurrentGame.sims3 is where the game stores your saved game as you are playing the game, but it will be empty if you're not playing. Thumbnails is where the game stores the various icons for items and patterns in the game -- if you delete it, it will simply recreate itself (although that takes a while). The same goes for IGACache, SigsCache, and any of the aforementioned folders.
If I'm missing any information (or am just flat out wrong), please feel free to add to this or correct me! I'd like for this guide to be as accurate as possible, and I won't take offense. But your Simself may find itself in a dungeon full of ugly kids.

GameSave Manager
http://gsm.duncsweb.com
Ferramenta para fazer backup de jogos.
Possui suporte a quase 500 jogos (incluindo TS2 e TS3).
Cria um arquivo único com o backup de vários jogos ou o de um único jogo (vc pode fazer o backup de todos ao mesmo tempo ou em separado).
Possui a possibilidade de vc mesmo criar um script para fazer o backup de jogos não incluídos ou personalizados.
Excelente taxa de compressão (o arquivo de backup fica bem menor se vc só copiar).
Configuração para agendar backups.