readonly=on worked (at least with -F), but then it got the error creating a
mountpoint I mentioned above. So I took away readonly=on, and it got past that
part, however the snapshots past the first one take an eternity. I left it
overnight and it managed to get from 21MB copied for the second snapshot to
26MB. Admittedly, I'm trying to back up to a thumb drive (a fast one), but the
first snapshot it copies over, which contains 13GB, doesn't take very long. It
slows to a crawl after the first snapshot is copied. iostat shows the thumb
drive at 100% busy, but it's not actually doing much. I'll try turning off
atime and not using -F and possibly also not auto-mounting the backup drive
(mountpoint=legacy or mountpoint=none I guess) so as to eliminate other
possible sources of changed data. Anyone know why it would go so slow after
the first snapshot?
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