EFS backup

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Incremental backup 樹狀的備份，只會被份修改的部分。刪除舊的部分，由於有特殊的刪除內部機制，也不會導致新的備份不可用。

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You can access and modify your Amazon EFS file systems while your backup is occurring in AWS Backup. However, inconsistencies, such as duplicated, skewed, or excluded data, can occur if you make modifications to your file system while the backup is occurring. These modifications include write, rename, move, or delete operations.

備份時不建議頻繁修改檔案

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• 100 MB/s for file systems composed of mostly large files
• 500 files/s for file systems composed of mostly small files
• The maximum duration for a backup operation in AWS Backup is thirty days.

Using AWS Backup doesn't consume accumulated burst credits, and it doesn't count against the General Purpose mode file operation limits.

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Backups that aren't completed during the specified window are flagged with an incomplete status. During the next scheduled backup, AWS Backup resumes at the point that it left off.

Backup window 沒做完，下個 backup window 會接著繼續做

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You can use AWS Backup to back up all data in an EFS file system, whatever storage class the data is in. You don't incur data access charges when backing up an EFS file system that has lifecycle management enabled and has data in the Infrequent Access (IA) storage class. When you restore a recovery point, all files are restored to the Standard storage class.

IA 的備份不用額外費用。還原後都會跑到 Standard 。

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AWS Backup limits backups to one concurrent backup per resource. Therefore, scheduled or on-demand backups might fail if a backup job is already in progress.

一個資源同時只能跑一個備份 job

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The default backup plan and backup vault cannot be deleted.

刪不掉的 backup vault

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Amazon EFS applies the aws:elasticfilesystem:default-backup system tag key with a value of enabled to EFS file systems when automatic backups are enabled.

EFS 使用 tag 讓 backup 可以抓到資源。

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Sockets and named pipes are not supported, and are omitted from backups.

不支援 Sockets and pipes

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The default EFS backup vault Access policy is set to deny deleting recovery points. To delete existing backups of your EFS file systems, you must change the vault access policy.

預設無法刪除 recovery point

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After restoring a recovery point, data fragments that can't be restored to the appropriate directory are placed in the aws-backup-lost+found directory. Fragments might be moved to this directory if modifications are made to the file system while the backup is occurring.

複製出錯的檔案可能會放在 lost+found 資料夾裡面。