I’d be interested to hear your opinions/experiences on this one. Martyn Greswolde of Greswolde Photography in the UK posted advice to his readers that if you run a backup (on referenced masters) while Aperture is running, not only will it not back up those masters, but it could actually corrupt your backup file. The backup solution he’s using is Chrono Sync.

Read his post, and if you have any experience with using third-party local backup solutions, please share your experience in the comments here.