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bjoern_tantau@swg-empire.de ⁨3⁩ ⁨days⁩ ago

In general you backup everything that cannot be recreated through external services. So that would be the configuration files and all volumes you added. Maybe logfiles as well.

If databases are involved they usually offer some method of dumping all data to some kind of text file. Usually relying on their binary data is not recommended.

Borg is a great tool to manage backups. It only backs up changed data and you can instruct it to only keep weekly, monthly, yearly data, so you can go back lately.

Of course, just flat out backing up everything is good to be able to quickly get back to a working system without any thought. And it guarantees that you don’t forget anything.

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tal@lemmy.today ⁨3⁩ ⁨days⁩ ago
If databases are involved they usually offer some method of dumping all data to some kind of text file. Usually relying on their binary data is not recommended.

It’s not so much text or binary. It’s because a normal backup program that just treats a live database file as a file to back up is liable to have the DBMS software write to the database while it’s being backed up, resulting in a backed-up file that’s a mix of old and new versions, and may be corrupt.

Either:

The DBMS needs to have a way to create a dump — possibly triggered by the backup software, if it’s aware of the DBMS — that won’t change during the backup

or:

One needs to have filesystem-level support to grab an atomic snapshot (e.g. one takes an atomic snapshot using something like btrfs and then backs up the snapshot rather than the live filesystem). This avoids the issue of the database file changing while the backup runs.

In general, if this is a concern, I’d tend to favor #2 as an option, because it’s an all-in-one solution that deals with all of the problems of files changing while being backed up: DBMSes are just a particularly thorny example of that.

Full disclosure: I mostly use ext4 myself, rather than btrfs. But I also don’t run live DBMSes.
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mapleseedfall@lemmy.world ⁨3⁩ ⁨days⁩ ago
By everything, does this mean the docker file and its volume?

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- bjoern_tantau@swg-empire.de ⁨3⁩ ⁨days⁩ ago
  The whole drive. The docker file and volumes are the bare minimum.
  
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  - mapleseedfall@lemmy.world ⁨2⁩ ⁨days⁩ ago
    Sweet ill get to it
    
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