>> * An ability to store blobs on the disk file-system parallel to
>> store them in the db. This is to allow users to access the docs
>> stored without using the dbengine in case of system-panic. I
>> couldn't fine any blob-to-file udf. Anyone knows any?
>
> You will have to create your own UDF. There are some free UDF
> libraries with full source code that you can use to create your UDF.

Just do not forget to build-in some restrictions into this UDF
(e.g. to limit it to only some specific directories, otherwise users could
overwrite system files etc.)

Ivan