[Box Backup] Controlling rate in lazy mode

[Adrian Cox]

I'm using boxbackup on three Debian boxes. I've found that lazy mode is
really more like hyperactive mode, and the continual churning of the
disks has a noticeable effect on interactive use of the machine.

I can cure the problem by switching to snapshot mode and running nightly
snapshots. But I do like the concept of lazy mode, and it would be
useful to be able to throttle the rate of disk I/O. Any suggestions as
to how I could do that?

- Adrian Cox
Humboldt Solutions Ltd.