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btrfs-image [options] source target
btrfs-image is used to create an image of a btrfs filesystem. All data
will be zeroed, but metadata and the like is preserved. source is the
special file corresponding to the device containing a btrfs filesystem.
(e.g /dev/sdXX). target is the image file that btrfs-image creates.
When used with -r option, btrfs-image restores the image file from
source into target.
-r restore metadump image.
compression level (0 ~ 9).
number of threads (1 ~ 32) to be used to process the image dump
btrfs-image is part of btrfs-progs. Btrfs is currently under heavy
development, and not suitable for any uses other than benchmarking and
review. Please refer to the btrfs wiki http://btrfs.wiki.kernel.org
for further details.