Sergi, I cannot help you directly, but I can mention that I'm getting the same error when performing a data backup, it never happened before and there is enough space on disk. Perhaps it means allocating main memory? But 'free' shows 20G so this might not be it. Moreover, the backup data seems to have been created correctly, the file sizes are roughly equal to the old ones. My error is
2014-06-12T11:39:23+02:00 P004431 1468f72102b ERROR BACKUP SAVE DATA finished with error: [447] backup could not be completed, [1000002] Allocation failed ; $size$=536870912; $name$=ChannelUtils::copy; $type$=pool; $inuse_count$=1; $allocated_size$=536870912
-- Micha