Fix link in _index.md
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### Snapshots
-Kopia uploads directories and files to remote storage called [Repository](../architecture/) and maintains a set of historical point-in-time snapshot records based on defined policies.
+Kopia uploads directories and files to remote storage called [Repository](../repositories/) and maintains a set of historical point-in-time snapshot records based on defined policies.
Kopia uses [content-addressable storage](https://en.wikipedia.org/wiki/Content-addressable%20storage) for snapshots, which has many benefits:
