OK, I've been saving backups to the internal disk and copying them to a USB. Obviously that will run out of space soon, so I've ordered a 16GB microSD. No big deal, only $13.58 and it looks simple to install.
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Graham, Korg Pa1000, Korg G1 Air, Countryman E6, Roland BA330, 2 x Roland CM-30, , Mackie SRM150