Kopia uploads directories and files to remote storage called Repository and maintains a set of historical point-in-time snapshot records based on defined policies.

Kopia uses content-addressable storage for snapshots, which has many benefits:

• Each snapshot is always incremental, no data included in previous snapshots is ever re-uploaded to the repository based on file content.
• Multiple copies of the same file will be stored once. This is known as de-duplication.
• After moving or renaming even large files, Kopia can recognize that they have the same content and won’t need to upload them again.
• Multiple users or computers can share same repository: if users share the same files, they are also uploaded only once.

NOTE: that there is currently no access control mechanism within repository - everybody with access to repository can see everyone’s data.