I'm backing up zimbra opensource with a back up script provided by one of the forums member....I've setup up cronjob to execute the backup jobs i.e differntial daily and full backup job weekly....so my question would be will the last full backup and differential backup suffice in case of restoring zimbra intimes of disaster.also the files backed up daily & weekly takes away a lot of backup disk space...so I would like to delete the previous backup files,if it's really not needed in times of recovery...so could anybody give some suggestions on this..