Marcel Janssen wrote:
Well, I managed to start the old postgresql, but I can't backup : $ pg_dumpall > postgresql_fc4_datapg_dumpall: could not connect to database "template1": FATAL: user "root" does not exist
The default configuration uses ident authentication, so you should use the postgres user to perform your backup:
# su postgres -c pg_dumpall > postgresql_fc4_data