On Mon, May 5, 2014 at 4:53 PM, Carlos Galeano <cgaleano AT logise.com DOT gt> 
wrote:
> okay, I'll explain to make sense.
> I need to store a copy of the backup off the server, and if this is a large
> file is difficult to do, that's why I need to split the tar file into
> multiple files.

You could use the 'archive host' feature of backuppc to create the
split tar archive in a directory.   On the other hand you have to go
through the web interface to start it each time and the command line
version could run automatically from cron.

> the problem is if I need to restore some files from this backup, reattach
> the parts can be a time-consuming task.
> The one tar file can be up to 50GB, split into 5Gb each part

> Restoring a file from the web works if the backup still exists on the
> server, but for space, I delete the backups over 60 days old.
> So my question is, can i restore files from tar files without joining them
> again?

There's no way to tell which part would contain which files - and if
you compressed before splitting you have to uncompress from the
beginning.  (Tar isn't that great at resyncing either, although it
should try).   You probably already know you can cat/zcat the stream
piped to the tar extract, but I'll mention it just in case you were
rebuilding it in a file first.   If you know the file structure you
might be able to create separate tars of specific paths to make the
likely targets easier.

My recommendation is to keep backups online longer to make using the
archived copies rare.    All of the old files that still exist
unchanged will be pooled anyway and not taking additional space.

-- 
   Les Mikesell
    lesmikesell AT gmail DOT com

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