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Cheers. I'd favour a disk image over copying files (easier to restore and I seem to remember stuff about rsync not necessarily playing nicely with NTFS drives). dd could be an option unless anyone has any better suggestions. Something that produces images on the basis of space used rather than SD card size would be good.
Although I assume this will founder where I often do with problems on writing to a samba share.
I have a variety of Pi's with various different OSs (home assistant, volumio, raspbian, etc) that I want to back up to a network drive every week or so.
What are the suggestions for this? Some kind of cron job triggering some kind of script or something, would that work on the variety of different Pi OSs? (I know what all those words mean but little idea of how I'd make that work.)