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10_Wiki/Topic_Programming/Topic_SQL/SQL_Backup_DB.md

@@ -0,0 +1,74 @@
+---
+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).