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surely you can use the sd rescue package, but why?
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well as I said, i got a bit confused by your answer and was looking for an alternative, let me explain. You said
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the full image won't help you with repartitioning. it's for backup purposes only. additionally, you will have to dump each partition one by one...
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(I knew how to do the full backup, but was not sure how to dump each partition by itself.) but then you said
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data partition and reader partition do not have to be restored. uppon boot, the reader will re-initialize them. all other partitions (system, fonts, etc.) are kept untouched. backup them one by one and then restore them one by one.
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I was thinking well, I would only touch /data and READER. And upon reboot they would be re-initialized by the reader. So whats the point of doing any backup at all? Wouldn't it be easier to just delete - recreate - label - reboot? why backing up and restoring partitions i didnt even touch? On top of that I was going to start from a clean state anyway (cleanup/unroot->root->repartition) without any data on it i would lose. Thats why the rescue-packages came to my mind. They contain everything what has to be on the reader at that point.
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have you ever used a partitioning tool to move / resize / backup / restore partitions?
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Yes i have, but I said I'm nor a linux-guy. I used it to resize/move/create partitions on my external hdd and on my laptop. But the only filesystems I worked with are ntfs/fat/fat32. I never had to backup/restore a partition, I just copy/pasted the content...