usage: btrfs-image [options] source target

Create or restore a filesystem image (metadata)

Options:
-r                        restore metadump image
-c value                  compression level (0 ~ 9)
-t value                  number of threads (1 ~ 32)
-o                        don't mess with the chunk tree when restoring
-s                        sanitize file names, use once to just use garbage, use twice if you want crc collisions
-w                        walk all trees instead of using extent tree, do this if your extent tree is broken
-m                        restore for multiple devices
-d                        also dump data, conflicts with -w

General:
--version                 print the btrfs-image version, builtin features and exit
--help                    print this help and exit

In the dump mode, source is the btrfs device and target is the output file (use '-' for stdout).
In the restore mode, source is the dumped image and target is the btrfs device/file.