Suppose I have a zpool with a single disk and some datasets, some files written to them, and a snapshot snap-1.
Now I create a raw image t-1.img of the disk.
Afterwards, I write some more files, create another snapshot snap-2 and create a new image t-2.img.
If I now partially update t-1.img with the contents of t2.img, e.g. due to an aborted rsync --inplace, do I get any guarantees about the consistency of the file systems on that inconsistent disk image? I obviously don't expect anything about snap-2 or files written afterwards, but can I expect to be able to read the data from snap-1, since it is read-only and present in both images?
Also, does it in this scenario make any difference whether the pool is unmounted before the backup images are created? Do some ZFS options, e.g. deduplication, compression, or encryption, affect the outcome?
