Hi Daniel,

In both cases the backup failed in its last stage which is a cleanup stage.
In that stage empty files, that were created by the mapreduce library (for 
kinds with a small amount of entities), are being removed.
The failure is triggered when there are more than 500 files to be deleted 
and is going to be addressed soon.
I can either cleanup your failed backups or change them to be marked as 
complete (leaving the empty files in place).
Also, as a workaround to prevent this kind of failure, until a fixed is 
available, I suggest you backup 15 kinds or less at a time.

Arie.


On Friday, March 16, 2012 6:08:04 PM UTC-7, Daniel Behnen wrote:
>
> Hi Arie, 
>
> thanks for your reply. The id is friends4school and please feel free 
> to check the logs and backup metadata. Thanks in advance! 
>
>
> Daniel 
>
> On 16 Mrz., 21:48, Arie Ozarov <[email protected]> wrote: 
> > Hi Daniel, 
> > 
> > We can tell more if you give us the application id and a permission to 
> > check the related logs and backup metadata. 
> > 
> > Arie. 
> > 
> > 
> > 
> > On Thursday, March 15, 2012 11:40:33 AM UTC-7, Daniel Behnen wrote: 
> > 
> > > Hi, 
> > 
> > > when trying to create a backup of all my tables, many map reduce tasks 
> > > (>1,000) are spawn but one task does not complete successfully. The 
> > > remaining task calls "POST /_ah/datastore_admin/queue/deferred" and 
> exists 
> > > with error code 500. 
> > > Now there are two stalled tasks in the default queue, one for each 
> backup 
> > > run and the backups do not show up in the backup list. 
> > 
> > > Is there a way to complete the running backups or to start a 
> successful 
> > > backup? 
> > 
> > > Thanks!

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