Rake-task daily backup will make gitlab freeze

rake-task daily backup with a retention of 15 days locally will will make gitlab freeze every 15 days and need to reboot it so it will work again. check the sylog and it will freeze during the upload to s3. not so familiar with this as I am new with this, how can we check the logs of the upload as I might see any clue of what could have cause this. router logs show the upload occurred but when I check s3 bucket on the day the gitlab freeze, nothing there. hope someone can help me on this.