Hi John,
On Wed, Feb 18, 2009 at 01:24:16PM -0600, John Goerzen wrote:
> >> So, given that, I don't really understand why there is a distinction
> >> between a full and an incremental backup. Shouldn't either one take
> >> up the same amount of space? That is, if you've got few changes on
> >> the client, then on the server you're mostly just hardlinking things
> >> anyway, right? So why is there a choice?
> >
> > With the tar and smb backup methods, full runs transfer everything from
> > the remote, incrementals transfer only files with timestamps newer than
> > the last full. With rsync, a full does a block checksum compare of all
> > files, incrementals only files where the timestamp or length differ. On
> > the server side, fulls rebuild a complete tree of links, incrementals
> > only have the differing files.
>
> So, if I use the rsync method, is there any reason to ever run a full
> backup after the very first one? It seems like all the info needed
> would be preserved, even if that very first full backup gets deleted
> eventually, right?
No, there is still info missing: The incremental has "holes" - unchanged
files are not linked into the directory tree, so you'll lose files. Just
don't bother about the fulls - have BackupPC take them once in a while.
Bye,
Tino.
--
"What we nourish flourishes." - "Was wir nähren erblüht."
www.lichtkreis-chemnitz.de
www.craniosacralzentrum.de
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