Feature: Add Info about vault recovery options

docs/desktop/vault-recovery.md

@@ -0,0 +1,79 @@
+---
+id: vault-recovery
+title: Vault Recovery
+sidebar_position: 20
+---
+
+# Vault Recovery
+
+If a vault cannot be added to Cryptomator or opened from inside the app anymore, you can use the Vault Recovery feature to unlock it again.
+
+:::note
+Vault Recovery does not restore your encrypted files.
+It only recreates missing configuration files such as `vault.cryptomator` in order for Cryptomator to recognize and unlock your vault again.
+:::
+
+It helps with the following scenarios:
+
+1. The masterkey file is missing or damaged - [`Recover Masterkey file`](#recover-masterkey-file)
+1. The vault config file is missing or damaged - [`Recover Vault config file`](#recover-vault-config)
+1. The masterkey and the vault config files are missing or damaged - [`Recover Masterkey and Vault config files`](#recover-full)
+
+If the damaged vault has not yet been added to Cryptomator, you start the recovery during the import process, see [`Add a vault with missing config files and restore them`](#add-recover-vault).
+
+:::warning
+Recovery of missing files is only supported starting with Vault Format 8 (introduced in Cryptomator 1.6.0).
+Vaults created with older formats (e.g., Vault Format 7 or earlier) are not compatible with these recovery options.
+For details, see the [Vault Format History](/docs/misc/vault-format-history.md).
+:::
+
+## Recover Masterkey file {#recover-masterkey-file}
+
+If the file `masterkey.cryptomator` is missing from your vault folder, Cryptomator will still recognize the folder as a normal vault.
+
+When you try to unlock the vault, a dialog appears saying “Masterkey file not found.”
+
+In this dialog, you can:
+- `Choose` a masterkey file manually, if it was stored outside the vault folder.
+- Or check the option “Restore the masterkey file instead” and click `Restore`.
+
+For the latter case, you need the vault recovery key to restore the masterkey file.
+You’ll be guided through the recovery process and on success, you can unlock the vault as usual.
+
+## Recover Vault config file {#recover-vault-config}
+
+If the file `vault.cryptomator` is missing, Cryptomator can recreate it using either your vault password or your recovery key.
+
+In the vault list, the vault is marked with an exclamation mark.
+In Vault Details, you’ll see `Vault config is missing.`.
+Here you can click `Restore vault config` to start the recovery process.
+
+You either need the Recovery Key or the vault password to restore the vault config file.
+You’ll be guided through the process and on success, you can open the vault as usual.
+
+## Recover Masterkey and Vault config files {#recover-full}
+:::note
+If the vault is created with Cryptomator Hub, you can’t restore the missing config files yourself.
+Please contact the vault owner, who can recreate the configuration file for you.
+:::
+
+If both config files – `masterkey.cryptomator` and `vault.cryptomator` – are missing, Cryptomator can restore them using your recovery key.
+
+In the vault list, the vault is marked with an exclamation mark.
+In Vault Details, you’ll see `Vault config is missing.`.
+Here you can click “Restore vault config” to start the recovery process.
+
+You need the Recovery Key to restore the vault config file.
+You’ll be guided through the process and on success, you can open the vault as usual.
+
+## Add a vault with missing config files and restore them {#add-recover-vault}
+
+If a vault has no configuration files and has not yet been added to Cryptomator, you recover it during the import process.
+
+Open the main window and click the plus `+` button.
+In the context menu, choose `Recover Existing Vault…`.
+
+Then select the vault directory you want to recover.
+Depending on which configuration files are missing, Cryptomator picks the right recovery options and will guide you through the same steps as described above.
+
+After the process completes, the restored vault will be added to your vault list automatically.