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From Daniel Doubleday <>
Subject Re: best way to backup
Date Fri, 29 Apr 2011 08:58:28 GMT
What we are about to set up is a time machine like backup. This is more like an add on to the
s3 backup.

Our boxes have an additional larger drive for local backup. We create a new backup snaphot
every x hours which hardlinks the files in the previous snapshot (bit like cassandras incremental_backups
thing) and than we sync that snapshot dir with the cassandra data dir. We can do archiving
/ backup to external system from there without impacting the main data raid.

But the main reason to do this is to have an 'omg we screwed up big time and deleted / corrupted
data' recovery.

On Apr 28, 2011, at 9:53 PM, William Oberman wrote:

> Even with N-nodes for redundancy, I still want to have backups.  I'm an amazon person,
so naturally I'm thinking S3.  Reading over the docs, and messing with nodeutil, it looks
like each new snapshot contains the previous snapshot as a subset (and I've read how cassandra
uses hard links to avoid excessive disk use).  When does that pattern break down?  
> I'm basically debating if I can do a "rsync" like backup, or if I should do a compressed
tar backup.  And I obviously want multiple points in time.  S3 does allow file versioning,
if a file or file name is changed/resused over time (only matters in the rsync case).  My
only concerns with compressed tars is I'll have to have free space to create the archive and
I get no "delta" space savings on the backup (the former is solved by not allowing the disk
space to get so low and/or adding more nodes to bring down the space, the latter is solved
by S3 being really cheap anyways).
> -- 
> Will Oberman
> Civic Science, Inc.
> 3030 Penn Avenue., First Floor
> Pittsburgh, PA 15201
> (M) 412-480-7835
> (E)

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