[Zope] Backing up Data.fs

[Peter Sabaini]

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Toby Dickenson wrote:
> On Monday 02 June 2003 10:18, Peter Sabaini wrote:
> 
>>in the upcoming 2.6 edition of the zope book i (hopefully) covered this
>>(http://www.zope.org/Documentation/Books/ZopeBook/2_6Edition/MaintainingZop
>>e.stx).
> 
> 
> That /etc/cron.daily/zbackup.cron script is dangerous in several ways. Think 
> of backup as a database operation  -  this script has no ACID.
> 

please explain -- why would i need transactions and concurrency with a 
backup script?

> rsync doesnt even give any performance advantage here. rsync is good if you 
> are doing backups remotely over ssh, but for local backups (like this script) 
> it cant beat "cp".

not that i have any numbers to back this up but i think that just 
copying the difference of two similar Data.fs's can be advantageous with 
large files -- of course this will really only make a difference if the 
backup is to a network mount or something like that.

> I strongly recommend DirectoryStorage if you want to keep daily backups like 
> this. It has a standard tool for creating local incremental backups as tar 
> files, or synchronising a remote replica of the storage. These tools are 
> ACID, and efficient. Unlike all the home-brew FileStorage schemes I have 
> seen.

DirectoryStorage sounds great if you have the requirements, but for 
simpler sites (or sites which host their data in an RDBMS anyway) 
FileStorage is just ok.

  - peter.


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