Translation guide
A secondary account used as a reserve or alternative, often for financial, digital, or contingency purposes.
A secondary bank or financial account used for savings, emergencies, or as a reserve.
General term for a backup account in banking. '予備' means reserve or spare.
緊急時に備えて、予備の口座を開設しました。
I opened a backup account in case of emergencies.
Literally 'sub-account', often used for secondary or linked accounts.
A secondary user account for online services, used for recovery or alternative access.
Standard term for a backup account in digital contexts.
パスワードを忘れた場合のために、予備のアカウントを登録してください。
Please register a backup account in case you forget your password.
An account (email or phone) used specifically for account recovery or verification.
Specifically means 'recovery account', used in account security settings.
復旧用アカウントとして別のメールアドレスを追加しました。
I added another email address as a recovery account.
予備 (yobi) is the most natural and versatile term for 'backup' in Japanese. サブ (sub) implies a secondary or auxiliary account, often used casually. バックアップ (backup) is a direct loanword and sounds more technical or IT-focused. For general use, prefer 予備.
メイン口座とは別にサブ口座を持っています。
I have a sub-account separate from my main account.
Direct loanword translation, less common but understood in tech/finance contexts.
バックアップ口座として別の銀行を利用しています。
I use another bank as a backup account.
Commonly used for secondary or alternative accounts on platforms.
ゲーム用にサブアカウントを作りました。
I created a sub-account for gaming.
Direct loanword, used in IT contexts but less natural than 予備のアカウント.
バックアップアカウントを設定しておくと安全です。
It's safe to set up a backup account.
Means 'backup contact', often used for phone numbers or emails for verification.
予備の連絡先を登録しておくと、ログインできなくなったときに便利です。
Registering a backup contact is useful when you can't log in.