A storage device that has been initialized with looks like this. Only two partitions, an ESP and a Data partition. Each Linux system is in a different folder, with each version under the same tree. And, in each folder, the data belonging to each version.

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Each Linux system is self-contained in a single file, IMAGE.0, and the previous version of it is kept as a backup IMAGE.0.zs-old.

This file allows znx to rollback to a previous state if the new one doesn't work.

User data is kept in the folder DATA and is stored on the device using OverlayFS. Using the GRUB parameter ZNX_OVERLAYS the user can define which folders are put in the overlay.

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