On Sun, 30 Jun 2013 01:17:04 -0700 Grant <emailgrant AT gmail DOT com> wrote:
> On Linux, how is communication between the clients and the backup
> server achieved as far as security?  Does the backup server pull or do
> the clients push and as which user?

This depends on the transfer method:
 - tar and rsync tunnel their data over ssh -> secure.
 - rsyncd afair uses its own (simple?) encryption.
 - smb gives you the usual windows-security -> nill.

And as reading the basic docs of backuppc tell you, the server pulls
the changes from the clients automatically or when told via the
web-interface.

> Can the web server reside on a different system than the backup
> server?

Yes, but the web-interface has to have read-access to the
backuppc-filesystem to show you the current state and select files for
restore and stuff. If you really must, you can run the daemon and the
web-interface on separate machines and nfs-mount /var/lib/backuppc from
the daemons machine to the web-server.
But there is no real advantage in that, the web-interface isn't used
that heavily, its not slowing the daemon down if you run both on the
same machine. And you save administration-nightmare when you just run
both on the same machine.

Have fun,

Arnold

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