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SDCard from backup doesnt start


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SDCard recreated from .iso image does not boot.





I use an Odroid as my Minecraft server. I have a fast 32GB card in it, and a usb hdd for swap and media files.


After the setup was working, and after each update, I pulled the card from the machine (after shutting down) and plugged it into my PC to make a backup:


dd if=/dev/sdc bs=4M | gzip -c >/media/backup/odroid.img.gz


In case I ever needed to recreate the card, I have this line to run:

gunzip -c /media/backup/odroid.img.gz | dd of=/dev/sdc bs=4M


/dev/sdc is a placeholder for whichever drive my USB Cardreader is appearign as.


I do have a https enabled Apache webserver with some static content, a Mumble voicechat server for gaming voicechat, Dokuwiki for my occasional bouts of hobby writing and a lot of other little tidbits on the machine, such as a VPN and one of these mediaserver thingies for my TV.

That is a LOT of hand crafting that went into it over the years, and I am effectively unable to recreate all the little things I added over the years, which is why a new setup is something I am scared shitless imagining.

Also, I named every backup separately, so I do have a LOT of backups - my backup drive is 4TB in size and my systems run on average on a space budged of 32 to 64 GB, my home partition being rsynced to a NAS via 1GB ethernet on each shutdown.


When my SDCard died after years of trusty service and I replaced it with a newer, faster card, writing the isoimage went smoothly, the ext4 partition was flawless un doing fsck on it before doing sync and then pulling the card.


However, the machine doesn't start. Power LED goes on, but nothing else happens.




The error I see - Power LED on, no Keepalive LED blinking - makes me guess the bootloader isn't - or wasn't - backed up with the method I used.

However, the way I use DD I am very sure it should copy the whole drive inclusive the bootloader, grub, lilo, uboot or whatever else there might be on it.

Even cloning Amiga HDDs works flawlessly with DD this way.


So, assuming I am correct and the way the backup was made was correct:

1) is there a known way to get an image written to SDCard that wil lhave the odroid bootloader workable?

2) is there a trick, like creating a new SDCard from an Armbian image and then copying the /dev/sd*1 partition from the image file to the newly made sdcard, that might get the image working?

3) Which other recommendations or suggestions ( I don't know, like mounting a rewritten image and a newly made SDCard and then doing cp -a /mnt/source/* /mnt/target/ ?) that might help me get my system back to working do you people have?


With kind regards,

a frustrated SDCard-user


(with HDDs doing DD in the manner described above works nicely since almost 20 years for me, cloning systems between machines, replacing deceased drives and so on )


Board: Odroid C2
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