Cool MateBackup vs Spare
When to use each in English, with meaning, register, and examples.
Backup
Top 1,000 (very common)C1noun
Spare
Top 2,000 (common)B2adjective
Most common: Backup
| Backup | Spare | |
|---|---|---|
| Pronunciation | 🇬🇧 /["/ˈbækʌp/"]/🇺🇸 /["/ˈbækʌp/"]/ | 🇬🇧 /["/speə(r)/"]/🇺🇸 /["/sper/"]/ |
| Meaning | A copy of data to keep safe. | extra or unused. |
| Example | The police had backup from the army. | He's studying music in his **spare time**. |
| Register | Neutral | Neutral |
| How common | Top 1,000 (very common) | Top 2,000 (common) |
| CEFR level | C1 | B2 |
| Part of speech | noun | adjective |
| Collocations | data backup, create a backup, backup plan, full backup | spare time, spare parts, spare room, spare change, spare tire |
| Antonyms | delete, erase, lose | deplete, consume, use up |
| Common mistakes | Using 'backup' as a verb incorrectly; it's often used as a noun., Confusing 'backup' with 'backup up' which implies physical support rather than data., Not distinguishing between the types of backups (full, incremental). | Confusing 'spare' with 'share'., Using 'spare' with uncountable nouns incorrectly., Misplacing it in a sentence, like saying 'spare me some time' instead of 'spare some time for me.' |
| Usage notes | Use in tech contexts when discussing data safety. Formal in business settings, neutral in casual conversations. Avoid in informal spoken language. | Use 'spare' to describe something extra that can be used if needed. It's common in everyday conversation and writing, but avoid using it in overly formal contexts. |
Frequently asked questions: Backup vs Spare
What's the difference between Backup and Spare?
Backup: A copy of data to keep safe. Spare: extra or unused.
Which is more common: Backup and Spare?
Backup is the most common in everyday English.
Are Backup and Spare the same CEFR level?
Backup: C1, Spare: B2 on the CEFR scale.
Can I use Backup and Spare interchangeably?
Not always. Backup and Spare are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.