borgbackup/borg

restore big files/block devices with considering already present data

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#5,638 创建于 2021年1月20日

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 (5 评论) (0 反应) (1 负责人)Python (10,086 star) (732 fork)batch import
cmd: extractenhancementfilesystemhelp wanted

描述

I use borg to make backups of my LVM volumes. It works fine at backup creation time but not as good when I do 'borg extract'. It pulls many gigabytes of data from remote borg repo server although I still have an almost unchanged device in place.

It would be nice to have an option to not just extract data from a borg repo but to also check against an existing file/block device, if it already has the required data and only retrieve changed data from the remote repo.

贡献者指南

技术栈
python
领域
backenddata
议题类型
feature
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
4
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
3-5 days
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
blocked
清晰度议题是否清楚说明期望改动、验收标准和下一步。
mostly clear
前置要求
understanding of borg's extraction mechanismPythonblock device handling
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
20
研究方向
Investigate the borg extraction code in borg/archive.py and borg/extract.py. Understand how current extraction works and how to add an option to compare existing data before fetching chunks from remote. Review the issue comments for any prior discussion about implementation details. The feature requires modifying the extraction pipeline to check local data and only fetch missing or changed chunks.