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What is Windows.old folder? Explaining how to safely delete / keep it

"Windows.old" folder that suddenly appears after Windows update.

While it takes up between 20 and 30 GB of space, it is also an important folder that you need to revert to the original version.

An easy-to-understand introduction to how to safely delete and keep when you don't want to lose!

Try AOMEI Backupper (home version) for free with registration code "AMAB-9RV3F-DNLO8-LGDYR"!

# Windows PC Trouble Lack of Storage # Windowsold Computer Organization

2025/8/29 Edited to

... Read moreWindows.oldフォルダはシステムを以前の状態に復元するためのバックアップとして非常に重要ですが、そのまま放置するとストレージ容量を大きく圧迫します。そのため、不要と判断した場合は速やかに削除することをおすすめします。 削除する前には必ずバックアップを取ることが安心で、特に重要なファイルが入っている場合は「AOMEI Backupper」などの無料バックアップツールを使って、外付けドライブやクラウドに保存するのが効果的です。これは万が一のデータ紛失への保険となります。 また、Windowsの設定画面から「ストレージ」→「一時ファイル」→「以前のWindowsのインストール」にチェックを入れて削除を実行することで、システムに不要なファイルのみを安全に消去できます。手動でフォルダを削除するよりも安全かつ確実な方法です。 誤って重要なフォルダを移動や削除してしまわないよう、普段から定期的なバックアップやストレージ整理を心がけると安心。特にPCのメモリ使用率も余裕を持たせることで、動作の安定性や快適さも向上します。 パソコン廃棄時のデータ消去や、ランサムウェアなどのセキュリティ対策としてもバックアップを暗号化しておくことがおすすめです。私も実際にバックアップを暗号化したことで、安心感が増しました。これらのポイントを押さえて、Windows.oldフォルダを正しく管理し、ストレージの無駄遣いを防ぎましょう。

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