> In this case, can you use a RAID mirror or something, then break it?
>
> Also, there's the LVM snapshot at the block layer someone already
> mentioned, which when used with smaller partions is less overhead.
> (less FS delta)
All these "solutions" don't work out, I cannot remount R/O my partition,
and LVM low-level snapshots or breaking a RAID mirror simply won't work
out. I would have to remount r/o the partition to get a consistent image
in the first place, so the first step must fail already...
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