lk/data/backups/unison.md
Malin Freeborn ba8026e0c3
change formatting
input examples are now given as

```bash
input $ARG1
```

While outputs use md's '> ' sign as a quote.
2023-06-17 21:28:20 +02:00

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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).
```bash
unison -version
```
Create the `~/.unison` directory on both machines.
Make a job called `backup`:
```bash
JOB=backup
```
Here is an example job, which synchronizes the `~/music` directory with a remote machine which has the same username.
```bash
echo "
auto = true
root=$HOME
root=ssh://$USER@$IP_ADDRESS/$HOME
path=music
ignore=Name *.flac
" > ~/.unison/"$JOB".prf
```
Remember to specify `$IP_ADDRESS`
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:
```bash
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.