What are some common strategies for backup and restore?
有哪些常見的備份並還原策略？
Common backup methods include:
Full-image backup: You back up the full image of your data to create a restore point you can instantly roll back to. Because you’re performing a full backup, this technique takes the longest to store.
Differential backup: Backs up all changes since the last full-image backup. Restoration only requires two files: the last full-image backup, followed by the most recent differential backup.
Incremental backup: You incrementally back up changes since the last full-image restore point. After a set number of incremental backups, the cycle completes with a full-image backup. Restoration starts with the last full-image backup, followed by incremental backups to the target RPO.
Real-time backup: Also called a continuous backup, this method involves instantly copying every change to your data to a separate storage device. It provides the most granular and comprehensive backup.
常見的備份方法有：
完整備份：備份資料的完整映像來建立還原點，以立即回到該點。由於要執行完整備份，所以這種技術需要花最久的時間儲存。
差異備份：備份自上次完整備份以來的所有變更。此種復原只需要兩個檔案：上一次的完整備份，然後即可取得最新的差異備份。
增量備份：在上一次完整還原之後，為所有變更進行增量備份。設定一定數量的增量備份後，這個循環會以完整影像備份作結。還原過程會從最後一次的完整備份開始，然後接著進行目標 RPO 的增量備份。
即時備份：也稱為連續備份，每次資料變更後，會馬上將變更複製到另一個獨立的儲存設備。這能提供了最精細且最全面的備份。