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1

The answer is given in the comment of @Dougie: First boot expands the root FS to fill the whole SDCard. That's done with /etc/init.d/resize2fs_once which runs on first boot then gets deleted. That's there on RaspiOS Buster Lite. and in the comment of @JaromandaX: automatic resizing done automatically - the clue is in the word "automatic" - yes, ...


0

The risk damage due to power loss is greatly exaggerated. Over 7 years using 9 Pi I have never experienced filesystem corruption due to power loss, although failed upgrades, user error and 2 worn out SD Cards have caused problems. Attempting to have RO partitions is unlikely to help. The mapping between partition and physical storage is under the control of ...


2

For an embedded project of mine, I use ro boot and rootfs, and two rw btrfs mirror raid partitions. I can cut power at anytime I need to, and my device can boot as the boot and root part are not modified. I chose btrfs as it has copy-on-write feature, with synchornization and snashots.


1

It seems your SD Card has left its life time. Restoring a backup to it doesn't make much sense. Use a new SD Card to restore the backup to it.


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