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Using rsync for backups, because it's not shiny and new (tinkerbetter.tube)
submitted 1 year ago by to c/selfhosted@lemmy.world
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You might not even like rsync. Yeah it's old. Yeah it's slow. But if you're working with Linux you're going to need to know it.

In this video I walk through my favorite everyday flags for rsync.

Support the channel:
https://patreon.com/VeronicaExplains
https://ko-fi.com/VeronicaExplains
https://thestopbits.bandcamp.com

Here's a companion blog post, where I cover a bit more detail: https://vkc.sh/everyday-rsync

Also, @BreadOnPenguins made an awesome rsync video and you should check it out: https://www.youtube.com/watch?v=eifQI5uD6VQ

Lastly, I left out all of the ssh setup stuff because I made a video about that and the blog post goes into a smidge more detail. If you want to see a video covering the basics of using SSH, I made one a few years ago and it's still pretty good: https://www.youtube.com/watch?v=3FKsdbjzBcc

Chapters:
1:18 Invoking rsync
4:05 The --delete flag for rsync
5:30 Compression flag: -z
6:02 Using tmux and rsync together
6:30 but Veronica... why not use (insert shiny object here)

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[–] 6 points 1 year ago* (last edited 1 year ago) (6 children)

It works fine if all you need is transfer, my issue with it it's just not efficient. If you want a "time travel" feature, your only option is to duplicate data. Differential backups, compression, and encryption for off-site ones is where other tools shine.

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  • [–] 4 points 1 year ago (1 child)

    I have it add a backup suffix based on the date. It moves changed and deleted files to another directory adding the date to the filename.

    It can also do hard-link copied so that you can have multiple full directory trees to avoid all that duplication.

    No file deltas or compression, but it does mean that you can access the backups directly.

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  • [–] 3 points 1 year ago

    Thanks! I was not aware of these options, along with what other poster mentioned about --link-dest. These do turn rsync into a backup program, which is something the root article should explain!

    (Both are limited in some aspects to other backup software, but they might still be a simpler but effective solution. And sometimes simple is best!)

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  • [–] 1 point 1 year ago* (2 children)

    If you want a “time travel” feature, your only option is to duplicate data.

    Not true. Look at the --link-dest flag. Encryption, sure, rsync can’t do that, but incremental backups work fine and compression is better handled at the filesystem level anyway IMO.

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  • [–] 1 point 1 year ago* (last edited 1 year ago) (1 child)

    Isn't that creating hardlinks between source and dest? Hard links only work on the same drive. And I'm not sure how that gives you "time travel", as in, browsing snapshots or file states at the different times you ran rsync.

    Edit: ah the hard link is between dest and the link-dest argument, makes more sense.

    I wouldn't bundle fs and backup compression in the same bucket, because they have vastly different reqs. Backup compression doesn't need to be optimized for fast decompression.

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  • [–] 1 point 1 year ago

    Snapper and BTRFS. Its only adjusts changes in data, so time travel is just pointing to what blocks changed and when, and not building a duplicate of the entire file or filesystem. A snapshot is instant, and new block changes belong to the current default.

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  • [–] 1 point 1 year ago*

    Agree. It's neat for file transfers and simple one-shot backups, but if you're looking for a proper backup solution then other tools/services have advanced virtually every aspect of backups so much it pretty much always makes sense to use one of those instead.

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