lk/data/backups/unison.md
2022-11-28 23:50:53 +01:00

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---
title: "unison"
tags: [ "Documentation", "Backups" ]
---
Install unison on both machines, and make sure both have the same version of unison, with the same version of the ocaml compiler (the smallest difference will cause problems).
> unison -version
Create the `~/.unison` directory on both machines.
Make a job called `backup`:
> vim ~/.unison/*backup*.prf
You can name the file anything, but it must end in .prf.
Here is an example job, which synchronizes the `~/music` directory with a remote machine.
```
auto = true
root=/home/ghost
root=ssh://ghost@192.168.0.10//home/ghost/
path=music
ignore=Name *.flac
```
The last command means it will ignore any file with a name ending in `.flac`.
## Automatic Runs
The first command means this will run but also confirm which files will be deleted, and which will be transferred, us `batch = true` instead.
Or you can deleted that line in the `.prf` file and run it with a flag:
> unison -batch *backup*.prf
Set unison to run with crontab or a systemd unit file to have directories synchronize automatically.
## Problem Solving
You will see data files summarizing what has happened in the `~/.unison` directory.
If something goes wrong, you may be prompted to delete these to start again.