RuneAudio Forum

I wonder what's the best way to backup an existing runeaudio installation.

I have tested both dd from my Linux installation and w32diskmanager from Windows and they backup my whole sd card which is approx 8 gb.

Could I use dd with 'count' option to just dd the mb used in my card or it would cause any trouble?

You can use the count option to limit to the 2GB size, but that's still backing up the entire 2GB. It's a good start, but you probably want to just backup the things you've changed.
That way you can apply those changes to a new release if you want (warning: things change in new releases and your old files may not work properly). That being said, I can't currently tell you all the files you should backup individually. I would guess the /var/lib/mpd directory as well as /var/www, at a minimum, but I haven't fully tested any of that yet. Maybe some stuff in /etc as well.

Anyway, back to your original question, here's the basic idea for limiting your dd image:

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dd if=/dev/<sdcard> of=~/backup.dd count=2000683008

Or, run with a larger block size to increase the speed a bit:

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dd if=/dev/<sdcard> of=~/backup.dd bs=1M count=1908

(double-check the syntax for dd on your system.Example: bs=1M doesn't work on OS X; it requires bs=1m. Your system may vary as well)

2,000,683,008 is the byte count for the original image, so that should be all you need to capture into an image. 1908 is because the bs=1M takes 1048576 bytes at a time. 1,048,576 x 1908 = 2,000,683,008

If that's confusing, let me know and I'll try to clarify.

Thank you very much! Everything was very well understood.