eMMC backup

[MarkHaysHarris777]

I would suggest using tar to make backups. It been with us for ages, is much simpler to use and won't detroy your drive.

I also prefer tar for backups of filesystems on gnu+linux;  particularly my favorite unix command:

tar  -cvf  -  -C  /home  save_directory  |  tar  -xvf  -

... which, while preserving permissions (and can be run recursively) backs-up the save_directory via standard output! 

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Here is the problem with using tar in the case of eMMC:  what we are backing up is actually about seven (or more) partitions !  The only way to really backup the eMMC so that it can be restored is to backup the disk 'image' including all partitions ( this is a bit for bit copy of the disk structure ).  Only dd (or dd like) utility can do this effectively.