Thanks for the clarification. The key issue, then, is for people running other filesystems in Linux. And especially for *BSD users. Re LUKS, I meant to use a t

Thanks for the clarification. The key issue, then, is for people running other filesystems in Linux. And especially for *BSD users. Re LUKS, I meant to use a tool that converts the encrypted LUKS volume (on this machine, /dev/md1) to an image file. Working in a USB drive, say. Then storing that 500GB (or whatever) file in Dropbox. If that's too big, then have a separate smaller LUKS volume. Or even, for VMs, a LUKS-encrypted VDI. Also, the unencrypted LUKS volume can just be ext4, for Dropbox compatibility.