Ok. I found out that using the floppy disk drive is probably no good
test case for checking robustness if disk space runs low during a
backup.
I found out that the Firebird Services Managers dumps a text to the
console when the disk is full asking for the next floppy to proceed
with the backup (multi-volume). Of course, this will usually not be
seen in a server programme, so the question is, is it really a good
idea to have such messages that require interactivity in the Firebird
Services Manager?
Anyway, does somebody know what happens if drive space runs low on a
harddisk drive? The same message? Or an error?
In my current implementation I decided not to use the verbose option
anymore and am not using isc_service_query to get the process
messages of my backup action.
Nevertheless, I am looking for an alternative way to check, if a
backup was successful, as I want to send an email to an administrator
if something went wrong. Any ideas how to test for a successful
backup of your database?
Any help will be greatly appreciated,

Regards,
Ingo Hunsinger