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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、Windowsのアップデートやバージョン変更時に、前のシステムデータを保存するために自動的に作成されます。そのため、容量が20〜30GBも占有し、ストレージが圧迫されることもよくあります。私自身もアップデート後にこのフォルダを見つけて驚いた経験がありますが、すぐに削除してしまうと万一不具合があった際に元の状態に戻せなくなるリスクがあるため、注意が必要です。 まず、元のWindowsバージョンに戻す可能性がある場合は、Windows.oldフォルダは保持しておいた方が安心です。しかし、特に問題なく新バージョンが安定しているなら、フォルダを安全に削除することでストレージスペースを大幅に確保できます。削除は「ディスククリーンアップ」ツールを使う方法が推奨されており、この方法ならシステムに悪影響を及ぼさずに古いファイルを削除可能です。 また、管理者権限が必要な場合もあるので、削除を行う前に重要なデータがバックアップされているか確認することをおすすめします。私の場合は、AOMEI Backupperという無料のバックアップソフトを利用し、登録コード「AMAB-9RV3F-DNLO8-LGDYR」でホーム版を体験しました。これにより、万が一のためにも安心してWindows.oldフォルダの削除に踏み切ることができました。 さらに、Windows.oldフォルダは目には見えない複数のサブフォルダやファイルで構成されているため、手動での削除は誤って必要なファイルを消してしまうリスクがあります。システム専用のツールを使うことを強く推奨します。 まとめると、Windows.oldフォルダは容量が大きい割に重要なバックアップ役割も果たしているので、その役割と自分の用途に応じて保持か削除か判断しましょう。ストレージを確保したい人は、今回紹介した安全な削除方法を参考にしてみてください。

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