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选题: 20190425 Automate backups with restic and systemd
sources/tech/20190425 Automate backups with restic and systemd.md
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[#]: collector: (lujun9972)
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[#]: translator: ( )
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (Automate backups with restic and systemd)
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[#]: via: (https://fedoramagazine.org/automate-backups-with-restic-and-systemd/)
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[#]: author: (Link Dupont https://fedoramagazine.org/author/linkdupont/)
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Automate backups with restic and systemd
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======
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![][1]
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Timely backups are important. So much so that [backing up software][2] is a common topic of discussion, even [here on the Fedora Magazine][3]. This article demonstrates how to automate backups with **restic** using only systemd unit files.
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For an introduction to restic, be sure to check out our article [Use restic on Fedora for encrypted backups][4]. Then read on for more details.
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Two systemd services are required to run in order to automate taking snapshots and keeping data pruned. The first service runs the _backup_ command needs to be run on a regular frequency. The second service takes care of data pruning.
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If you’re not familiar with systemd at all, there’s never been a better time to learn. Check out [the series on systemd here at the Magazine][5], starting with this primer on unit files:
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> [systemd unit file basics][6]
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If you haven’t installed restic already, note it’s in the official Fedora repositories. To install use this command [with sudo][7]:
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```
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$ sudo dnf install restic
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```
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### Backup
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First, create the _~/.config/systemd/user/restic-backup.service_ file. Copy and paste the text below into the file for best results.
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```
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[Unit]
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Description=Restic backup service
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[Service]
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Type=oneshot
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ExecStart=restic backup --verbose --one-file-system --tag systemd.timer $BACKUP_EXCLUDES $BACKUP_PATHS
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ExecStartPost=restic forget --verbose --tag systemd.timer --group-by "paths,tags" --keep-daily $RETENTION_DAYS --keep-weekly $RETENTION_WEEKS --keep-monthly $RETENTION_MONTHS --keep-yearly $RETENTION_YEARS
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EnvironmentFile=%h/.config/restic-backup.conf
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```
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This service references an environment file in order to load secrets (such as _RESTIC_PASSWORD_ ). Create the _~/.config/restic-backup.conf_ file. Copy and paste the content below for best results. This example uses BackBlaze B2 buckets. Adjust the ID, key, repository, and password values accordingly.
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```
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BACKUP_PATHS="/home/rupert"
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BACKUP_EXCLUDES="--exclude-file /home/rupert/.restic_excludes --exclude-if-present .exclude_from_backup"
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RETENTION_DAYS=7
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RETENTION_WEEKS=4
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RETENTION_MONTHS=6
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RETENTION_YEARS=3
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B2_ACCOUNT_ID=XXXXXXXXXXXXXXXXXXXXXXXXX
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B2_ACCOUNT_KEY=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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RESTIC_REPOSITORY=b2:XXXXXXXXXXXXXXXXXX:/
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RESTIC_PASSWORD=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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```
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Now that the service is installed, reload systemd: _systemctl –user daemon-reload_. Try running the service manually to create a backup: _systemctl –user start restic-backup_.
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Because the service is a _oneshot_ , it will run once and exit. After verifying that the service runs and creates snapshots as desired, set up a timer to run this service regularly. For example, to run the _restic-backup.service_ daily, create _~/.config/systemd/user/restic-backup.timer_ as follows. Again, copy and paste this text:
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```
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[Unit]
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Description=Backup with restic daily
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[Timer]
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OnCalendar=daily
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Persistent=true
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[Install]
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WantedBy=timers.target
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```
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Enable it by running this command:
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```
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$ systemctl --user enable --now restic-backup.timer
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```
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### Prune
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While the main service runs the _forget_ command to only keep snapshots within the keep policy, the data is not actually removed from the restic repository. The _prune_ command inspects the repository and current snapshots, and deletes any data not associated with a snapshot. Because _prune_ can be a time-consuming process, it is not necessary to run every time a backup is run. This is the perfect scenario for a second service and timer. First, create the file _~/.config/systemd/user/restic-prune.service_ by copying and pasting this text:
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```
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[Unit]
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Description=Restic backup service (data pruning)
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[Service]
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Type=oneshot
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ExecStart=restic prune
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EnvironmentFile=%h/.config/restic-backup.conf
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```
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Similarly to the main _restic-backup.service_ , _restic-prune_ is a oneshot service and can be run manually. Once the service has been set up, create and enable a corresponding timer at _~/.config/systemd/user/restic-prune.timer_ :
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```
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[Unit]
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Description=Prune data from the restic repository monthly
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[Timer]
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OnCalendar=monthly
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Persistent=true
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[Install]
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WantedBy=timers.target
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```
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That’s it! Restic will now run daily and prune data monthly.
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* * *
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_Photo by _[ _Samuel Zeller_][8]_ on _[_Unsplash_][9]_._
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--------------------------------------------------------------------------------
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via: https://fedoramagazine.org/automate-backups-with-restic-and-systemd/
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作者：[Link Dupont][a]
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选题：[lujun9972][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://fedoramagazine.org/author/linkdupont/
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[b]: https://github.com/lujun9972
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[1]: https://fedoramagazine.org/wp-content/uploads/2019/04/restic-systemd-816x345.jpg
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[2]: https://restic.net/
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[3]: https://fedoramagazine.org/?s=backup
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[4]: https://fedoramagazine.org/use-restic-encrypted-backups/
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[5]: https://fedoramagazine.org/series/systemd-series/
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[6]: https://fedoramagazine.org/systemd-getting-a-grip-on-units/
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[7]: https://fedoramagazine.org/howto-use-sudo/
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[8]: https://unsplash.com/photos/JuFcQxgCXwA?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText
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[9]: https://unsplash.com/search/photos/archive?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText
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