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Add guidance on using Corso repos (#2315)

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## Description

Clarify how Corso repositories and object storage buckets are related.

## Does this PR need a docs update or release note?

- [x] ⛔ No 

## Type of change

- [x] 🗺️ Documentation
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Niraj Tolia 2023-01-30 09:03:18 -08:00 committed by GitHub
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website/docs/setup/repos.md
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@ -10,9 +10,15 @@ import TabItem from '@theme/TabItem';
import TOCInline from '@theme/TOCInline';
import {Version} from '@site/src/corsoEnv';
A Corso [repository](../concepts#corso-concepts) stores encrypted copies of your backup data. Corso uses
A Corso [repository](../concepts#corso-concepts) stores encrypted copies of a Microsoft 365 tenant's
backup data. Each repository is configured to store data in an object storage bucket and, optionally,
a user-specified prefix within the bucket. A repository is only meant to store a single tenant's data
but a single object storage bucket can contain multiple repositories if unique `--prefix` options are
specified when initializing a repository.
Within a repository, Corso uses
AES256-GCM-HMAC-SHA256 to encrypt data at rest using keys that are derived from the repository passphrase.
Data in flight is encrypted via TLS.
Data in flight to and from the repositiry is encrypted via TLS.
Repositories are supported on the following object storage systems: