> My spare machines are connected by dedicated gigabit fiber in buildings
> 3 km apart. Once a week, I take an LVM snapshot, then use dd+ssh to copy
> the entire 1-TB filesystem image to the spare. This takes 14 hours. It's
> still faster than using rsync.

I use a similar approach, but backed up to encrypted volumes on removable
drives (CRU Dataport 25) that I carry off site.  The LVM snapshot is key,
so you get an image of the file system in a consistent state (I always
create the snapshot when backuppc is idle).

A refinement is to alternate among two or more backup drives, so that in
case the primary host goes down during a copy, you don't end up with your
only backup in an inconsistent state.


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