The Vault is where your images and metadata are stored. Access to this is restricted allowing ImgArchive to guarantee the integrity of your images and metadata.

Repositories

A repository is a storage location for managing files of various types. The Archive uses repositories to contain both the images and metadata. these are stored in date order. for example: an image dsc_090016.jpg dated 20 February 2020 will be 2020/2020-02-20/images/dsc_090016.jpg and the metadata information file for that image will be stored in 2020/2020-02-20/metadata/dsc_090016.jpg. To guarantee the integrity of both of images and metadata all the data is checksumed using both 64bit CRC and SHA256 checksums. These checksums are stored in a files and these files are further checksumed yielding a single checksum.

Main Repositories

Within the Vault are two repositories. Master and Derivative.

• The Master repository - contains your original images and metadata describing that original.

• The Derivative repository - contains versions of the original along with metadata describing those versions.

Backup Repositories

Each of the main repositories can optionally have up to two backup repositories. These repositories are duplicates of the main repository. These can be used to repair the main repository by replacing any damaged file with one from the backup.