>>>> 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.
>>
>> I would use this.
>>
>>> 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.
>>
>> Does that mean the server has root read access to the entire
>> filesystem of each of the clients via SSH keys?
>
> And usually write access as well.  Some people use a different login
> on the clients adding sudo with restrictions on the command that can
> be run as root.  You can also use restrictions with an ssh key for
> some control over the allowed commands, but you can't really get
> around the need to read anything you want to back up and to write if
> you want to restore.

Could I create hard links in a particular directory for the files to
be backed up on the client and limit permissions for the backup server
to that directory?

- Grant

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