---
id: sql-backup-db
title: "SQL Backup DB"
category: "Database"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["SQL BACKUP DATABASE Statement", "BACKUP DATABASE", "differential backup"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.87
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["sql", "database", "w3schools", "backup", "sqlserver"]
raw_sources: ["https://www.w3schools.com/sql/sql_backup_db.asp"]
applied_in: []
github_commit: ""
---

# [[SQL Backup DB]]

## 🎯 한 줄 통찰 (One-line insight)
BACKUP DATABASE (SQL Server) creates a full backup to disk, and WITH DIFFERENTIAL creates a faster, smaller backup capturing only changes since the last full backup. [S1]

## 🧠 핵심 개념 (Core concepts)
- **BACKUP DATABASE statement** — creates a full backup of an existing SQL Server database. [S1]
- **Syntax** — `BACKUP DATABASE databasename TO DISK = 'filepath';`. [S1]
- **BACKUP WITH DIFFERENTIAL** — captures only data changed since the last full backup; requires at least one prior full backup. [S1]
- **Syntax (differential)** — `BACKUP DATABASE databasename TO DISK = 'filepath' WITH DIFFERENTIAL;`. [S1]

## 🧩 추출된 패턴 (Extracted patterns)
- **Store backups on a different drive** — placing the backup on a separate drive from the original database protects against losing both to the same disk failure. [S1]
- **Full-then-differential strategy** — a differential backup reduces backup time by only capturing changes, but depends on a prior full backup existing. [S1]

## 📖 세부 내용 (Details)
- Full backup: `BACKUP DATABASE testDB TO DISK = 'D:\backups\testDB.bak';`. [S1]
- Differential backup: `BACKUP DATABASE testDB TO DISK = 'D:\backups\testDB.bak' WITH DIFFERENTIAL;`. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
소스에서 모순되는 정보는 발견되지 않음.

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — DROP DATABASE 같은 되돌릴 수 없는 작업 전에 선행되어야 하는 안전장치다. [S1]

## 💻 코드 패턴 (Code patterns)
Full and differential backup (SQL Server):
```sql
BACKUP DATABASE testDB
TO DISK = 'D:\backups\testDB.bak';

BACKUP DATABASE testDB
TO DISK = 'D:\backups\testDB.bak'
WITH DIFFERENTIAL;
```

## ✅ 검증 상태 및 신뢰도
- **상태:** draft
- **검증 단계:** conceptual
- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
- **신뢰 점수:** 0.87
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[SQL Tutorial]]
- **관련 개념:** [[SQL Create DB]], [[SQL Drop DB]]
- **참조 맥락:** 데이터베이스 삭제/변경 등 위험한 작업 이전에 항상 선행되어야 할 안전장치.

## 📚 출처 (Sources)
- [S1] W3Schools — SQL BACKUP DATABASE Statement — https://www.w3schools.com/sql/sql_backup_db.asp

## 📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "SQL BACKUP DATABASE Statement" page (Astra wiki-curation, P-Reinforce v3.1 format).