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Re: [K12OSN] Data Storage - Redundancy and Backup Suggestions



Rob Owens wrote:
A backuppc question:

If I'm using rsync as the backup method within backuppc, is there any
need to do a periodic full backup, or are incremental backups enough?


With the rsync method, even full backups don't actually transfer file files again and you should do them periodically. Before the 3.x versions, backups were always based on the last full, so the incrementals would transfer an increasingly large set of files. Now it is possible to base them on the last incremental instead, but it is still a good idea to do the fulls. The difference is that an incremental skips files where the name, length, and timestamp match your existing backup. On fulls, both copies are read and compared with the rsync block checkup algorithm. This takes some CPU time at both ends but not much bandwidth and verifies that your current copy is still good. Also during full runs the backup directory is completely rebuilt for faster access on the next run.

--
  Les Mikesell
   lesmikesell gmail com


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