Created Storage Backends (markdown)

Storage-Backends.md

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+Duplicacy currently supports local file storage, SFTP, and many cloud storage providers.
+
+<details> <summary>Local disk</summary>
+
+```
+Storage URL:  /path/to/storage (on Linux or Mac OS X)
+              C:\path\to\storage (on Windows)
+```
+</details>
+
+<details> <summary>SFTP</summary>
+
+```
+Storage URL:  sftp://username@server/path/to/storage (path relative to the home directory)
+              sftp://username@server//path/to/storage (absolute path)
+```
+
+Login methods include password authentication and public key authentication.  Due to a limitation of the underlying Go SSH library, the key pair for public key authentication must be generated without a passphrase.  To work with a key that has a passphrase, you can set up SSH agent forwarding which is also supported by Duplicacy.
+
+</details>
+
+<details> <summary>Dropbox</summary>
+
+```
+Storage URL:  dropbox://path/to/storage
+```
+
+For Duplicacy to access your Dropbox storage, you must provide an access token that can be obtained in one of two ways:
+
+* Create your own app on the [Dropbox Developer](https://www.dropbox.com/developers) page, and then generate the [access token](https://blogs.dropbox.com/developers/2014/05/generate-an-access-token-for-your-own-account/)
+
+* Or authorize Duplicacy to access its app folder inside your Dropbox (following [this link](https://dl.dropboxusercontent.com/u/95866350/start_dropbox_token.html)), and Dropbox will generate the access token (which is not visible to us, as the redirect page showing the token is merely a static html hosted by Dropbox)
+
+Dropbox has two advantages over other cloud providers.  First, if you are already a paid user then to use the unused space as the backup storage is basically free.  Second, unlike other providers Dropbox does not charge bandwidth or API usage fees.
+
+</details>
+
+<details> <summary>Amazon S3</summary>
+
+```
+Storage URL:  s3://amazon.com/bucket/path/to/storage (default region is us-east-1)
+              s3://region@amazon.com/bucket/path/to/storage (other regions must be specified)
+```
+
+You'll need to input an access key and a secret key to access your Amazon S3 storage.
+
+Minio-based S3 compatiable storages are also supported by using the `minio` or `minios` backends:
+```
+Storage URL:  minio://region@host/bucket/path/to/storage (without TLS)
+Storage URL:  minios://region@host/bucket/path/to/storage (with TLS)
+```
+
+There is another backend that works with S3 compatible storage providers that require V2 signing:
+```
+Storage URL:  s3c://region@host/bucket/path/to/storage
+```
+
+</details>
+
+<details>  <summary>Wasabi</summary>
+
+```
+Storage URL: s3://us-east-1@s3.wasabisys.com/bucket/path/to/storage
+```
+
+[Wasabi](https://wasabi.com) is a relatively new cloud storage service providing a S3-compatible API.
+It is well suited for storing backups, because it is much cheaper than Amazon S3 with a storage cost of $.0039/GB/Month and a download fee of $0.04/GB, and no additional charges on API calls.
+
+</details>
+
+<details>  <summary>Google Cloud Storage</summary>
+
+```
+Storage URL:  gcs://bucket/path/to/storage
+```
+
+Starting from version 2.0.0, a new Google Cloud Storage backend is added which is implemented using the [official Google client library](https://godoc.org/cloud.google.com/go/storage).  You must first obtain a credential file by [authorizing](https://duplicacy.com/gcp_start) Duplicacy to access your Google Cloud Storage account or by [downloading](https://console.cloud.google.com/projectselector/iam-admin/serviceaccounts) a service account credential file.
+
+You can also use the s3 protocol to access Google Cloud Storage.  To do this, you must enable the [s3 interoperability](https://cloud.google.com/storage/docs/migrating#migration-simple) in your Google Cloud Storage settings and set the storage url as `s3://storage.googleapis.com/bucket/path/to/storage`.
+
+</details>
+
+<details> <summary>Microsoft Azure</summary>
+
+```
+Storage URL:  azure://account/container
+```
+
+You'll need to input the access key once prompted.
+
+</details>
+
+<details> <summary>Backblaze B2</summary>
+
+```
+Storage URL: b2://bucket
+```
+
+You'll need to input the account id and application key.
+
+Backblaze's B2 storage is one of the least expensive (at 0.5 cent per GB per month, with a download fee of 2 cents per GB, plus additional charges for API calls).
+
+</details>
+
+<details> <summary>Google Drive</summary>
+
+```
+Storage URL: gcd://path/to/storage
+```
+
+To use Google Drive as the storage, you first need to download a token file from https://duplicacy.com/gcd_start by authorizing Duplicacy to access your Google Drive, and then enter the path to this token file to Duplicacy when prompted.
+
+</details>
+
+<details> <summary>Microsoft OneDrive</summary>
+
+```
+Storage URL: one://path/to/storage
+```
+
+To use Microsoft OneDrive as the storage, you first need to download a token file from https://duplicacy.com/one_start by authorizing Duplicacy to access your OneDrive, and then enter the path to this token file to Duplicacy when prompted.
+
+</details>
+
+<details> <summary>Hubic</summary>
+
+```
+Storage URL: hubic://path/to/storage
+```
+
+To use Hubic as the storage, you first need to download a token file from https://duplicacy.com/hubic_start by authorizing Duplicacy to access your Hubic drive, and then enter the path to this token file to Duplicacy when prompted.
+
+Hubic offers the most free space (25GB) of all major cloud providers and there is no bandwidth charge (same as Google Drive and OneDrive), so it may be worth a try.
+
+</details>