how can I recovery GPT table?

[Miroslav Lachman]

I got logged this message on one machine:

GEOM: da0: the secondary GPT table is corrupt or invalid.
GEOM: da0: using the primary only -- recovery suggested.

It is after some playing with glabel and gjournal, so it was my fault.

Is there any way how can I fix this problem? (everything is working 
fine... for now)

Or at least - how can I create backup of GPT tables to later restores?

Miroslav Lachman