Install Yocto image and backup

[Jupiter]

Hi Alexander,

Thanks for your advice.

> In my opinion two things are common practice:
>
> 1) Using a layer on top of raw NAND, like UBI/UBIFS nowadays, so bad blocks
> can be handled properly in a layer below your rootfs.

Yes, the UBI/UBIFS is used in NAND partitions, I guess you alluded
there is no need use the backup, right?

> 2) Using an A/B scheme for updating and using a well tested framework for
> that  (instead of self written shell scripts).  You don't need another NAND chip
> for that, just multiple partitions.  You can still have your kernel/rootfs read-only at runtime.

If I do need to use a backup, it won't need another NAND chip, it will
be another UBI/UBIFS partition. But I would like as simple as possible
if no backup is a common practice.

Thank you very much.

Kind regards,

-  jupiter