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btrfs: Support snapshotting and restoring nested Btrfs subvolumes (e.g. per-user /home/$USER) #929

@silverhadch

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@silverhadch

On Btrfs systems, user accounts can be created with their own nested subvolume under /home/$USER (for example via useradd). This allows snapshotting only that user’s data instead of the entire /home.

Snapm should fully support:

  • Creating snapshots of nested subvolumes

  • Restoring them in place, without moving the subvolume out of its mountpoint

This is critical for desktop systems where users want to roll back their own files without touching other users or the system.

CC: @Conan-Kudo

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