Btrfs

Introduction to btrfs Snapshots

I’ve been using btrfs for years, and one of its most powerful features is its ability to create snapshots. These are read-only copies of a subvolume at a particular point in time, which can be used for backups, testing, and even recovering from accidental file deletions or modifications. Don’t bother with other file systems if you need this level of flexibility.

Creating Snapshots

To get started with btrfs snapshots, you’ll first need to ensure that your system is using btrfs. Run lsblk -f and look for the btrfs label. If you’re using btrfs, creating a snapshot is straightforward:

Introduction to Btrfs Snapshots

I’ve worked with Btrfs for years, and its snapshot feature is one of my favorites. It allows you to create a read-only copy of a subvolume at a particular point in time, which is super useful for backups, testing, and rolling back changes. However, managing these snapshots can become a real pain, especially when dealing with a large number of them. In this article, I’ll show you how to troubleshoot Btrfs snapshot overfill issues using systemd timers and log rotation.

Introduction to Disk Usage Issues

I’ve seen disk usage issues plague even the most well-maintained Linux systems, often due to duplicate files and unnecessary logs. As of 2026, both Btrfs and Ext4 filesystems are widely used, each with their own set of tools and best practices for troubleshooting and resolving these issues. In this article, we’ll delve into practical steps for identifying and addressing duplicate files and unnecessary logs on both Btrfs and Ext4 filesystems, focusing on current tools and methodologies.

Introduction to Btrfs Snapshots

I’ve worked with Btrfs for a while now, and one of its most useful features is snapshotting. This allows you to create a read-only copy of a subvolume at a given point in time, which is perfect for backups, testing, and rolling back changes. However, over time, these snapshot copies can accumulate and consume significant disk space. In practice, this can become a real issue if you’re not careful.