Timothy J Massey wrote at about 18:44:06 -0400 on Tuesday, April 12, 2011:
 > "Jeffrey J. Kosowsky" <backuppc AT kosowsky DOT org> wrote on 04/12/2011 
 > 05:10:15 
 > PM:
 > 
 > > Timothy J Massey wrote at about 15:40:05 -0400 on Tuesday, April 12, 
 > 2011:
 > >  > "Jeffrey J. Kosowsky" <backuppc AT kosowsky DOT org> wrote on 
 > 04/10/201101:57:01 
 > >  > PM:
 > >  > 
 > >  > > The only problem with dd is that you would generally need to either
 > >  > > make a "snapshot" (e.g., using lvm2) or shutdown BackupPC and 
 > unmount
 > >  > > the drives to assure a perfect partition copy.
 > >  > 
 > >  > You always have to unmount (for it to work correctly, anyway), 
 > whether 
 > >  > you're dd'ing the partition raw or using LVM.  The difference with 
 > LVM is 
 > >  > that you only have to have it umounted for a brief moment, and 
 > without it 
 > >  > for the entire time of the DD.
 > > 
 > > Well with LVM, if you have a dedicated BackupPC partition, it should
 > > be sufficient to make sure no backup (or backuppc nightly process) is
 > > running and that you are not at one of the round-number o'clock wakeup
 > > times, then just doing a 'sync' followed by a lvm-snapshot should be
 > > sufficient. I agree though that unmounting would be simpler though and
 > > less likely to make mistakes.
 > 
 > Last I looked, if you dd a LVM snapshot of an EXT2/3 partition that is 
 > mounted R/W, it will be marked dirty on mount.  If this is not the case, 
 > then yes, quiescing BackupPC is enough.

I thought dynamic snapshots are supported now but I may be wrong...
 > 
 > However, we're talking about *backup* here.  I'm not a big fan of "should 
 > be OK":  I'd rather unmount the partition!  :)

Agreed... as I said it "would be simpler though and less likely to
make mistakes" but some people have a strong aversion for some reason
to ever taking down a drive...

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