no need for format specific getBackupFilePath

src/backuptargets.js

@@ -30,7 +30,9 @@ exports = module.exports = {
     getMountStatus,
     ensureMounted,
 
-    storageApi
+    storageApi,
+
+    getBackupFilePath
 };
 
 const assert = require('assert'),
@@ -97,6 +99,16 @@ function storageApi(backupTarget) {
     }
 }
 
+function getBackupFilePath(backupTarget, remotePath) {
+    assert.strictEqual(typeof backupTarget, 'object');
+    assert.strictEqual(typeof remotePath, 'string');
+
+    // we don't have a rootPath for noop
+    if (backupTarget.provider === 'noop') return remotePath;
+
+    return path.join(backupTarget.config.rootPath, remotePath);
+}
+
 function getRootPath(provider, config, mountPath) {
     assert.strictEqual(typeof config, 'object');
     assert.strictEqual(typeof mountPath, 'string');