In this episode of The Linux Podcast, Lucas and Luna dive into Btrfs copy-on-write snapshots, a feature that's quietly transforming how system administrators handle backups, rollbacks, and disk efficiency. Lucas explains the mechanics of CoW—how it avoids duplicating data by referencing extents—and contrasts it with traditional snapshot approaches like LVM. Luna brings up real-world scenarios: rolling back a system update in seconds, or snapshotting a database without a downtime window. They discuss the trade-offs: fragmentation over time, the need for periodic rebalancing, and why Btrfs is gaining traction in NAS devices like Synology's. By the end, you'll understand why Btrfs snapshots are not just a neat trick but a legitimate tool for production Linux environments.

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