- COW snapshot (cp --reflink=always) of package volumes before
install/update; restore on failure, remove on success
- Automatic ext4→btrfs conversion via btrfs-convert during disk attach
with e2fsck pre-check and post-conversion defrag
- Probe package-data filesystem during setup.disk.list (on both disk
and partition level) so the UI can warn about ext4 conversion
- Setup wizard preserve-overwrite dialog shows ext4 warning with
backup acknowledgment checkbox before allowing preserve
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