Apple Aperture Getting Started - Manual (Page 201)

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Backing Up Your Images
To safeguard your photography portfolio, it’s important to
establish a reliable backup system and back up regularly.
This chapter provides information about backing up the Library to a vault on an
external hard disk. It also provides information about deleting vaults to free up disk
space and restoring the Library from a vault.
An Overview of Backing Up Your Files
After you import images into Aperture and erase your camera’s memory cards, the only
copies of your digital master files reside on your computer. Digital images recorded on
your hard disk or other storage media can be effectively duplicated and stored for
safekeeping. Making backup copies provides reassurance that you can easily restore
your files should an unforeseen incident cause the loss of the files.
When you back up your images using Aperture, a complete copy of the Library is
made. Backups are not cumulative, which means that your last backup is the last
complete copy of the Library. If you remove items from the Library, those items are
removed from the vault when it is next updated. It’s best to back up the Library, or your
portfolio of images and projects, to an external hard disk drive. You may want to keep
one backup onsite and another one offsite. If you back up regularly, you run little risk of
permanently losing your work.