Poor title sorry.
Understanding that any OMV install will likely have growth etc., I'm trying to harmonize my OS image backups for a variety of SD cards and also reduce the time for backups. Let's say my minimum card size is 16GB (I know that actual size varies from card manufacturer to card manufacturer) and I've offloaded my storage/media and Docker installs to another drive(s).
I have a clean clone of the current install but as we know Armbian will extend itself out over any available space so I want to gpart things down to a minimal size with sufficient headroom.
I was just use 8GB as my standard but even that seems high. I get there's a lot of factors at play here but anyone who's been at this for a while have a reliable partition size for their clones images? Perhaps my logic is entirely flawed here to begin with...apologies in advance.