I know how to backup system image, but what if I want to restore the image to a different size of SD card that does not match the one I backup from? Generally 2 cases: 1. The source SD card is 16G, but I just used like 3-4G, I would like restore it on a 8G SD card. 2. The source SD card is 16G, and I just need to enlarge the space by replace it with a 64GB card, how can I extend the space after write the image?
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It depends on the file system used. – aventurin Dec 27 '18 at 13:55
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You can also use tar archives to backup the installation and restore it to a new SD Card of any size as long as the "old" installation fits to it. For this option you can look at [Howto prepare a SD card from a tar archive](https://raspberrypi.stackexchange.com/a/78467/79866). – Ingo Dec 27 '18 at 14:10
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*"I know how to backup system image"* -> The question implies the "how" here was to copy the entire card block for block, e.g., using `dd`. This works, but it is arguably the worst method that does -- partially because it is inflexible, which is the problem you have now. However, you can probably mount it and copy the contents onto a card of whatever size, if you read some of the stuff in the duplicate Q&A. – goldilocks Dec 27 '18 at 15:32