I recently upgraded the backup server at work. I was running Etch with BackupPC 3.1.0 from Backports.org. It is now running Lenny with BackupPC 3.1.0 from the Debian Lenny repository.

We do a daily dump of a number of backups to an external eSATA disk for sending off site. The backups are created using BackupPC_archiveHost wrapped in a script I wrote. The backups are written gzip compressed and encrypted with GnuPG.

Ever since the upgrade the writing of the off site backups has been taking up to 50% longer with a very noticeable increase in system load. Something has become inefficient as a result of the upgrade.

Tried:
* Booted the box on the previous Etch kernel. No change. Must be in userspace.
* Tested the performance of current and Etch versions of gzip and gpg. not much difference

Still investigating.....