@feng
in linux you can mount backup raw file to any directory and remove directories with the personal files /mnt/us, /mnt-base.
example:
Quote:
mount -o loop /tmp/backup.img /mnt/any_dir
rm -rf /mnt/any_dir/mnt/us /mnt/any_dir/mnt-base
tar -cvzf backup.tgz /mnt/any_dir
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As a result, the size of the backup.tgz archive will be ~200 Mb