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Make backup script more simple and updating the post

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Renne Rocha 2025-05-06 14:09:55 -03:00
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content/posts/20250430-creating-backups-for-fly-io-volumes.md
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@ -1,6 +1,7 @@
---
title: "Creating backups for fly.io Volumes"
date: 2025-04-30
lastmod: 2025-05-06
tags: ["self-host", "fly.io", "backup"]
slug: creating-backups-for-fly-io-volumes
---
@ -62,40 +63,28 @@ The volume is mounted in `/data` directory, defined in our application `fly.toml
## Creating a backup script
With the token, we can now create two scripts: one to run locally on the machine that will receive the backup data,
and another to be executed remotely on your Fly Machine. The example scripts are very simple, but you can improve
them by adding more capabilities, error handling, uploading the data to S3 buckets, and so on.
Given that we have a token, we are now able to execute SSH commands remotely on our Fly Machine. In
our scenario, I am compacting the whole content of `/data/` directory (where all the data that I want
to backup is located) generating a tarball, then I download it locally.
I could create a custom script and copy it to the remote machine if I want to perform more complex
tasks, or you can extend/modify this script to perform other tasks (e.g. download the tarball
and upload to a S3 bucket).
```
# local_backup.sh
#!/bin/bash
# backup.sh
# This call is needed to "wake-up" your machine if stopped
# Need to start container in fly.io if it was stopped by inactivity
curl -s -o /dev/null https://your-app.fly.dev/
# Execute the script that will generate a tarball of /data/ directory
fly ssh console -C 'sh remote_backup.sh' -t $FLY_SSH_TOKEN
# Copy the generated tarball to our local machine
fly ssh sftp get "/root/data_content_$(date +%F).tar.gz" -t $FLY_SSH_TOKEN
filename="data_backup_$(date +%F).tar.gz"
fly ssh console -C 'tar cvz /data' -t $FLY_SSH_TOKEN > $filename
```
```
# remote_backup.sh
tar czf "/root/data_content_$(date +%F).tar.gz" data/
```
You need to send `remote_backup.sh` to your Fly Machine. Adding the following line to your `Dockerfile` should be enough:
```
COPY remote_backup.sh /remote_backup.sh
```
Deploy your application again, and you can run `local_backup.sh`.
## Run it periodically
Now you can add `local_backup.sh` to your `crontab` schedule, or even adapt the procedure described here
Now you can add `backup.sh` to your `crontab` schedule, or even adapt the procedure described here
to be executed in other environments, like defining a GitHub Action or another way to schedule jobs.
I know this is not the most complete way to implement a backup policy, but it is working for my current projects.