i'm using the option for the OS partition only,
What is the name of the option you are using?
but the plugin is writing a file equivalent to the side of the SD card ( 64GB!!!).
And the backup file's final size would never be the size of the SD card since it is gzip'd
I recall using DD which I thought specified just the OS/Boot partition.
Unless you shrink the OS partition, the OS and boot partition take up the entire SD card. Therefore, the backup plugin is doing the correct thing.
The backup file was indeed 64gb though. I can screenshot later
If gzip couldn't compress the image at all, that would be amazing.
Again, is it possible that the Armbian/OMV install expanded itself out onto the entire SD card
It definitely does expand the OS partition to fill the rest of the card. Armbian and Raspberry Pi OS both do this.
Unless you shrink the OS partition, the OS and boot partition take up the entire SD card. Therefore, the backup plugin is doing the correct thing.
Ah Ha! So that's extremely valuable to know. I don't really see any of this in the help docs unless i've missed them. Is there a best practice for this (aside from / rather than cloning the SD? Specifically related to shrinking the partitions?
Also, I had planned to NAND-SATA-INSTALL my SD install to my eMMC module but will that even work now if the eMMC is smaller than the SD?
I don't really see any of this in the help docs unless i've missed them.
What help docs? The screen literally says it is expanding the OS partition when it boots the first time. I'm sure it is documented on the Armbian site and omv install guides.
Is there a best practice for this (aside from / rather than cloning the SD?
The two dd options are the only ones that backup blank space. fsarchiver and rsync just backup files. They aren't as easy to restore though (can't just write image to sd card). The best option is still to take the sd card out and clone it with clonezilla.
Specifically related to shrinking the partitions?
Shrinking? Boot gparted-live on the system you wrote the card with and shrink the partition. Easy.
Also, I had planned to NAND-SATA-INSTALL my SD install to my eMMC module but will that even work now if the eMMC is smaller than the SD?
Why? What are you hoping to gain? I've never used the nand-sata-install.
I'd like to have my one SD card slot available
Probably easier to just by a usb card reader if you need an SD card on an arm board.
I may wrongly be under the impression of a better lifespan for the eMMC vs SD.
It does last longer but is also a lot more expensive. I have had the same SD card on some of my systems for a couple of years. For the cost difference, you could just buy 3 SD cards and clone one to the others. If one started acting weird, switch to a new one.
Also, I'm wishing I had known in advance about the OS expansion since i'll only be able to clone to a card of equal size moving forward.
Not true. With rsync or fsarchiver, you could use any size as long as what was backed up wasn't larger than the new SD card. The best way to restore is write the armbian image to the new sd card and then restore the backup (just files) over that. It doesn't care what size the filesystem is.
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