BackupPC-users

Re: [BackupPC-users] How does BackupPC work?

2009-02-18 18:56:03
Subject: Re: [BackupPC-users] How does BackupPC work?
From: Les Mikesell <les AT futuresource DOT com>
To: "General list for user discussion, questions and support" <backuppc-users AT lists.sourceforge DOT net>
Date: Wed, 18 Feb 2009 16:16:38 -0600
John Goerzen wrote:
>> 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?

Rsync does its comparison against the previous full, so the incremental 
runs transfer more and more as changes accumulate.  Also, you can't 
delete a full when you have incrementals that depend on it.  The best 
strategy is to just skew the days when the fulls run (by manually 
forcing one at an appropriate time).

-- 
   Les Mikesell
    lesmikesell AT gmail DOT com


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