Translation guide
A secondary account used as a reserve or alternative, often for financial, digital, or contingency purposes.
I opened a backup account in case of emergencies.
Literally 'sub-account', often used for secondary or linked accounts.
I have a sub-account separate from my main account.
Direct loanword translation, less common but understood in tech/finance contexts.
I use another bank as a backup account.
A secondary user account for online services, used for recovery or alternative access.
Standard term for a backup account in digital contexts.
Please register a backup account in case you forget your password.
Commonly used for secondary or alternative accounts on platforms.
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.
An account (email or phone) used specifically for account recovery or verification.
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.
backup account (general)
sub-account (secondary)
backup account (technical)
It's safe to set up a backup account.
Registering a backup contact is useful when you can't log in.