Quick summary

Btrfs adds snapshots and self healing features that simplify recovery. Ext4 is simpler and available on more entry models.

If your NAS supports Btrfs and you want snapshots and fast rollback, it is usually the better default for shared data.

Features and differences

Performance considerations

For large sequential transfers both file systems can saturate 1 GbE and 2.5 GbE links when disks are healthy. Small file workloads may benefit from Btrfs features and SSD volumes.

• Use SSD cache or SSD volumes for metadata heavy tasks
• Tune indexing and thumbnail generation to off hours
• Keep volumes under capacity limits to avoid fragmentation issues

Snapshots and recovery

Snapshots allow quick rollback after accidental deletes or ransomware events.

• Schedule frequent snapshots during work hours
• Replicate snapshots to a second NAS for offsite rollback
• Test restores monthly with a small sample set

Compatibility and model support

Not all models support Btrfs. Confirm support on your target model before planning snapshots.

• Entry models may require Ext4 only
• Plus and higher models often support Btrfs with snapshots
• Check app specific requirements when mixing volumes

Use case recommendations

Simple rules of thumb for common buyers.

• Shared folders and team projects on models that support Btrfs
• Basic backup targets or entry models on Ext4
• SSD volumes for small file or VM workloads

FAQs

Answers to frequent file system questions.

• Can I convert between file systems? A rebuild is required, plan migration steps
• Is Ext4 less safe? Both are safe when backed up; Btrfs offers easier rollback
• Does Btrfs use more CPU? Overhead is small on supported models