borgbackup/borg

restore big files/block devices with considering already present data

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Aperta il 20 gen 2021

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 (5 commenti) (0 reazioni) (1 assegnatario)Python (10.086 star) (732 fork)batch import
cmd: extractenhancementfilesystemhelp wanted

Descrizione

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.

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Tech stack
python
Dominio
backenddata
Tipo issue
feature
DifficoltàQuanto dovrebbe essere impegnativa per un nuovo contributor.
4
Tempo stimatoTempo stimato per completare e verificare uno scope piccolo.
3-5 days
Stato attivitàQuanto è probabile che la issue sia ancora attiva e reviewable.
blocked
ChiarezzaQuanto chiaramente la issue descrive problema, scope e risultato atteso.
mostly clear
Prerequisiti
understanding of borg's extraction mechanismPythonblock device handling
Adatta ai principiantiQuanto la issue è adatta a contributor alla prima esperienza.
20
Direzione di ricerca
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.