> The backup disk is a 1TB USB drive, ext4, running through
> LUKS encryption since it goes offsite.  The USB bit seems to contribute
> more to slowness than the LUKS bit on this system.  But the end effect
> is that if BackupPC is being non-smart about how it accesses the disk on
> the server side, this will be magnified by the USB interface.

Another way to put this is that you'd like BackupPC to overcome
performance problems caused by your amazingly slow I/O.  Not that I'm
arguing against rewriting BackupPC to accomodate slow media, but I'm
certainly not going to bother, since it's certainly not slow for me.

Might I suggest that you back up to something quicker, and then copy it
over to your USB drive?  (If that's too slow, than I fail to see how
BackupPC can do any better.)

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