How to backup split databases so that the resulting files are also split, and then how to restore again.
To backup a multi-file database example.gdb + example.gd2 +
example.gd3 to the backup-files example.gbk + example.gb2 + example.gb3 use to following:
gbak -B -T -password masterkey -user sysdba -v example.gdb
example.gbk 1G example.gb2 1G exampke.gb3 1G etc....
add every backup-file to the command-line in the form filename size in bytes or M/G for mega-, gigabytes.
To restore a multi-file backup use the following:
gbak -r -o -p 8192 -password masterkey -user sysdba -v
example.gbk example.gb2 example.gb3 (continue...)
example.gdb 250000 example.gd2 250000 example.gd3
You have to include every backup-file in the command-line.
This works in the original open source release of interbase.