Re: [BackupPC-users] What are the advantages/disadvantages of smb vs rsyncd/rsync

[Xuo <xu...@fr...>]

Le 06/10/2010 15:04, Michael Stowe a écrit :
>>  Hi,
>>
>> I would like to backup some laptop computers (for my personal needs).
>> For the moment, I automount the shared directories of the Windows 7 PC
>> on my Linux backuppc server. This works fine but the problem is that
>> some backups are not performed when the laptop is shut down. The backups
>> start because the Linux server is running but the mount point is down.
>> I would like to know what are the advantages/drawbacks for laptop pcs of
>> the following policies :
>>
>>     * automount of shared directories + rsync (what I do now).
>>     * smb + tar
>>     * rsyncd
>>     * Other ?
>>
>> Thank you.
>>
>> Xuo.
> Well, if the laptop's down, none of these methods will help you back it
> up, obviously, but here's a brief outline of the pros and cons:
>
> * automount of shared directories + rsync (what I do now).
> Probably the least bandwidth-efficient, since rsync has to read every file
> over the mount.  Can't handle open files.
> * smb
> Requires the least amount of software on the client.  Uses timestamp for
> incrementals, so can miss copied files and renamed directories during
> incrementals.  Can't handle open files.
> * automount of shared directories + tar
> All the disadvantages of mounting plus all the disadvantages of tar
> * rsyncd/rsync
> Can be bandwidth efficient and seamless, there are scripts publicly
> available that can handle open files.  Within this category, the
> variations of ssh/rsyncd, rsyncd, winexe/rsync have varying degrees of
> speed, ease of deployment, and encryption.  I use the winexe/rsync method
> since we have no need of encryption, so we prioritize speed and ease of
> deployment.
Hi,

Thank you for your answer and sorry for the delay in response.

    * Point 1 : you say rsync has to read all files over the mount, but
      I think it is more or less the same for all methods.
    * Point 4 : it seems to be the most widely used but it needs so
      executables on all clients. This is a big disadvantage.
    * One point you did not mentioned and I considered as important (if
      I understand the way backupPC works).
          o In case of automounts, the mount point is considered as a
            local directory. If the laptop PC is shutdown, then the
            directory is considered empty and the backup ends normally.
            There is no more backup till the next usual one. 
          o If backups are done with smb, then, if the laptop is
            shutdown, the backup fails and it will be scheduled for the
            next time (for ex, one hour later). This is a major
            advantage of smb vs automount.
          o With rsync/rsyncd, I don't know what the behavior is.

Regards.

Xuo.
> * Other ?
>
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