rename getRootPath to getBackupRootPath

src/storage/interface.js

@@ -11,7 +11,7 @@
 //     for the other API calls we leave it to the backend to retry. this allows
 //     them to tune the concurrency based on failures/rate limits accordingly
 exports = module.exports = {
-    getRootPath,
+    getBackupRootPath,
     checkBackupPreconditions,
 
     upload,
@@ -47,7 +47,7 @@ function injectPrivateFields(newConfig, currentConfig) {
     // in-place injection of tokens and api keys which came in with constants.SECRET_PLACEHOLDER
 }
 
-function getRootPath(apiConfig) {
+function getBackupRootPath(apiConfig) {
     assert.strictEqual(typeof apiConfig, 'object');
 
     // Result: path at the backup storage