56 lines
1.3 KiB
Markdown
56 lines
1.3 KiB
Markdown
---
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title: "unison"
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tags: [ "Documentation", "Backups" ]
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---
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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).
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```bash
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unison -version
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```
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Create the `~/.unison` directory on both machines.
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Make a job called `backup`:
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```bash
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JOB=backup
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```
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Here is an example job, which synchronizes the `~/music` directory with a remote machine which has the same username.
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```bash
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echo "
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auto = true
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root=$HOME
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root=ssh://$USER@$IP_ADDRESS/$HOME
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path=music
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ignore=Name *.flac
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" > ~/.unison/"$JOB".prf
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```
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Remember to specify `$IP_ADDRESS`
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The last command means it will ignore any file with a name ending in `.flac`.
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## Automatic Runs
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The first command means this will run but also confirm which files will be deleted, and which will be transferred, us `batch = true` instead.
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Or you can deleted that line in the `.prf` file and run it with a flag:
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```bash
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unison -batch *backup*.prf
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```
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Set unison to run with crontab or a systemd unit file to have directories synchronize automatically.
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## Problem Solving
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You will see data files summarizing what has happened in the `~/.unison` directory.
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If something goes wrong, you may be prompted to delete these to start again.
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