First, I want to thank you for this great write up. Very easy to follow along without knowing what I'm doing (for parts of it). Question at step 2:

sudo rsync -avx / /ssd

After a long list of copied files, I get the following error:
rsync: write failed on "/ssd/lib/modules/4.19.115+/kernel/drivers/iio/pressure/bmp280-i2c.ko": Read-only file system (30)
rsync error: error in file IO (code 11) at receiver .c(374) [receiver=3.1.3]

Is his expected? Did I dod something wrong? How should I fix?

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