ok you are not 100% clear. if you have a backup server then use that to perform the backup. Id use rsync in combination of cron and set it to backup every 15min or so.
also keep in mind that in CentOS the default retention days for /tmp is roughly 28 days IIRC. this means that every day any file that is older then 28 days is removed from the system to never be found again
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