Would this work or would I have problems:
Using dd command to backup an entire SSD containing dual boot Windows/Ubuntu partitions into an .iso file, with the intent to then dd that iso back onto the same size SSD in the case of a drive failure?
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This will definitely work. I did this recently when upgrading a Steam Deck to a bigger drive. Other suggestions below are probably faster though.
Yes. Make sure neither are mounted.
Use larger block sizes with bs=<like, idk, 16M> will make it go faster.
