backups: add backup multiple targets

src/provision.js

@@ -20,6 +20,7 @@ const appstore = require('./appstore.js'),
     domains = require('./domains.js'),
     eventlog = require('./eventlog.js'),
     fs = require('fs'),
+    hush = require('./hush.js'),
     mail = require('./mail.js'),
     mailServer = require('./mailserver.js'),
     network = require('./network.js'),
@@ -239,7 +240,7 @@ async function restore(backupConfig, remotePath, version, ipv4Config, ipv6Config
         if (error) throw error;
 
         if ('password' in backupConfig) {
-            backupConfig.encryption = backupTargets.generateEncryptionKeysSync(backupConfig.password);
+            backupConfig.encryption = hush.generateEncryptionKeysSync(backupConfig.password);
             delete backupConfig.password;
         } else {
             backupConfig.encryption = null;