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For sims3packs,
backup the sims3pack files. For packages,
backup the package files.
You can also
backup the DCCache folder, which contains all your installed sims3pack content - this is useful if you no longer have the sims3packs for some content, however it means that if you ever have to use the backup, it's all or nothing - you can't restore some content and not restore some other content.
What I lack in decorum, I make up for with an absence of tact.