this post was submitted on 12 Sep 2025
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Selfhosted

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Backing up easily (sh.itjust.works)
submitted 2 days ago by bridgeenjoyer@sh.itjust.works to c/selfhosted@lemmy.world
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So I'm not really a selfhoster per say - but I run 2 NAS at home and I am working my way toward it. I don't really need my stuff open to the internet so I just use it on my LAN.

However I do have a lot of data, and I'm constantly backing things up. My question is - I have the following setup:

  1. Computer hard drives
  2. These backup to my NAS
  3. I have a separate HDD in an enclosure I plug into the NAS directly and copy my data onto every few months to put in my safe.
  4. Some cloud storage for very important smaller stuff (pictures)

My main question is - what is the best way to copy off new data from my NAS (Synology) to my "cold storage" drive, without recopying everything every time? is there a way to detect the files that exist on both and only copy new ones? I've always had this question when doing backups and it seems to always be overly complex.

You guys are very knowledgeable so I'm sure someone has dealt with this!

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[–] frongt@lemmy.zip 3 points 2 days ago (1 children)

Agreed. Rsync will happily sync a deletion you didn't mean to do.

[–] bandwidthcrisis@lemmy.world 1 points 1 day ago

Rsync can rename/move target changed or gone from the source.

I use those options so that I get a separate 'archive' dir next to my backup target, with old versions of files.

It's useful for loose collections such as photos.