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For one thing, Borg was designed to allow revision of archives.

This mission entailed certain complications. My mission was not merely to use Borg to create a backup, but to get that Borg backup onto read-only Blu-ray discs as a ransomware-resistant precaution. This introduction highlights several of those key points they are repeated in more detail below. It was OK – I was trying to get a feel for how Borg worked – but now I wanted to do a rewrite, boiling that long post down to the key points. My previous post was very long because I did a lot of wrestling and tinkering, and because I made a lot of mistakes. So if the next backup saved an updated version of that previous Word doc, again Borg would save pointers instead of full text + photograph whenever it could. It would do this, not only within a backup, but also across backups. Instead of storing two copies of that duplicative material, Borg would store one copy, and would replace the other with a pointer to the stored copy. It could find duplication even if there were no duplicate files – if, for example, two different Microsoft Word documents contained the same photograph. In Borg’s case, deduplication meant minimizing redundant chunks of data at the sub-file level.

The previous post explains that Borg (presently available only in Linux) achieved tremendous space saving for large archives by using deduplication.

A different post discusses a deduplication method using DoubleKiller. This post’s links to that previous post generally lead to the specific relevant section of that post that’s why there may be two or more links to that post in a single paragraph here. This post repeatedly refers to an earlier (very long) post that went through this process, including my attendant experiments and errors, in much greater detail. By the time I got to the third or fourth archive in a Borg repository, I was burning less than 10% as many BD-Rs as I would have been burning without Borg’s compression and, especially, its deduplication. To assist in the latter step, I used WinRAR to organize, compress, encrypt, and optimally size the material for burning onto BD-R. This post describes how I used Borg to create backups of multiple large filesets, and then back up the resulting Borg archives on Blu-ray disc.

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