Dan Langille writes: 

> 
> Have you considered that perhaps your backup is corrupted?  That is, the 
>   USB2 HDD that you have backed up to contains a disk error? 
> 
> I would be very careful with that HDD, whatever you do, especially if 
> that is your only backup of this data.
 

I'm starting an offline SMART test now but I doubt that this will reveal
anything. The disk has a UDMA_CRC_Error_Count of 1 but this is not that
much. Right now I can't think that the disk has a problem. If this would
be the case and I would access a file on a corrupt disk FreeBSD would have
spammed my console already with read errors. Same goes for write. 

I'll let you know what the SMART analysis revealed. 

Is there a way to force bacula to re-read the backups after they where
written or do I have to schedule continuous restores to make sure they stay 
readable?

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