Pg_dump and bytaA

Hello,

we have one table in database (db has over 200 tables), which has one
byteA filed for storing user photos. We are making backup every night, but
it is now too large because of photos. We do not need to make backup of
photos every night, but the question is how to backup database without
this field?
I tried to look at keys of pgdump, but found nothing...

Now we are using it like this:
pg_dump -f /home/backup/DB.sql -d -Fp -v DB

thx
Lukas

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