I'll take a look at it a bit deeper in the future.
What do you mean by starting two processes? running
FBBackupManager.backupDatabase() from two processes at the same time?
I am almost sure that didn't happen.

> If you can reproduce it only by starting two backup
> processes for the same database, then workaround is very simple -

don't do

> it... If that is something different, we have to try to find the

reason with

> firebird-devel together.
>
> Roman
>