You can use below query to find database backup time in Netezza environment. This query will provide the database backup time (Full / Differential / User backup) for each database along with the backup start and finish time. Query will not display any data for failed database backup attempts.
Here we will query system view _v_backup_history in system database.
select DBName, OPTYPE, starttime, lastupdate, (lastupdate-starttime)/60 as DurationInMinutes from _v_backup_history where status='COMPLETED' and DBNAME is NOT NULL and StartTime>'2012-10-01 00:00:00' order by DBName, starttime
Unfortunately, we cannot retrieve the backup location as it is not stored in any system table/view in Netezza. For that we have to look into the backup log file.