Hello, Paul,

> struct backup_id {
> unsigned long master_uid; // set from a generator in fbsecurity.fdb

^^^^^^^^^^^^ This may be replaced original database name

> unsigned short backup_id; // increments on each full backup
> unsigned short increment_id; // increments on each incremental backup, 0

^^^^^^^^^^^^ This is not needed. I've got needed SCN's and levels to check
order and detect missing parts of backup

> on full
> };

If you want to improve incremental backup utility, feel free to do it.
I'll not have much time for that and I do not have all variety of
backup devices in my lab here.

Nickolay Samofatov