diff --git a/src/storage/filesystem.js b/src/storage/filesystem.js
index be635f184..557e8d3b4 100644
--- a/src/storage/filesystem.js
+++ b/src/storage/filesystem.js
@@ -77,14 +77,23 @@ async function checkBackupPreconditions(apiConfig, dataLayout) {
     assert.strictEqual(typeof apiConfig, 'object');
     assert(dataLayout instanceof DataLayout, 'dataLayout must be a DataLayout');
 
-    const [error, rootPath] = await safe(df.file(getBackupRootPath(apiConfig)));
+    let backupRootPath;
+    if (apiConfig.provider === PROVIDER_SSHFS || apiConfig.provider === PROVIDER_CIFS || apiConfig.provider === PROVIDER_NFS || apiConfig.provider === PROVIDER_EXT4 || apiConfig.provider === PROVIDER_XFS) {
+        backupRootPath = paths.MANAGED_BACKUP_MOUNT_DIR;
+    } else if (apiConfig.provider === PROVIDER_MOUNTPOINT) {
+        backupRootPath = paths.apiConfig.mountpoint;
+    } else {
+        backupRootPath = apiConfig.backupFolder;
+    }
+
+    const [error, dfResult] = await safe(df.file(backupRootPath)); // without prefix in case it's not mounted at all
     if (error) throw new BoxError(BoxError.FS_ERROR, `Error when checking for disk space: ${error.message}`);
 
     // Check filesystem is mounted so we don't write into the actual folder on disk
     if (apiConfig.provider === PROVIDER_SSHFS || apiConfig.provider === PROVIDER_CIFS || apiConfig.provider === PROVIDER_NFS || apiConfig.provider === PROVIDER_EXT4 || apiConfig.provider === PROVIDER_XFS) {
-        if (rootPath.mountpoint !== paths.MANAGED_BACKUP_MOUNT_DIR) throw new BoxError(BoxError.FS_ERROR, 'Backup target is not mounted');
+        if (dfResult.mountpoint !== paths.MANAGED_BACKUP_MOUNT_DIR) throw new BoxError(BoxError.FS_ERROR, 'Backup target is not mounted');
     } else if (apiConfig.provider === PROVIDER_MOUNTPOINT) {
-        if (rootPath.mountpoint === '/') throw new BoxError(BoxError.FS_ERROR, `${apiConfig.backupFolder} is not mounted`);
+        if (dfResult.mountpoint === '/') throw new BoxError(BoxError.FS_ERROR, `${apiConfig.backupFolder} is not mounted`);
     }
 
     let used = 0;
@@ -98,7 +107,7 @@ async function checkBackupPreconditions(apiConfig, dataLayout) {
     debug(`checkBackupPreconditions: ${used} bytes`);
 
     const needed = 0.6 * used + (1024 * 1024 * 1024); // check if there is atleast 1GB left afterwards. aim for 60% because rsync/tgz won't need full 100%
-    if (rootPath.available <= needed) throw new BoxError(BoxError.FS_ERROR, `Not enough disk space for backup. Needed: ${prettyBytes(needed)} Available: ${prettyBytes(rootPath.available)}`);
+    if (dfResult.available <= needed) throw new BoxError(BoxError.FS_ERROR, `Not enough disk space for backup. Needed: ${prettyBytes(needed)} Available: ${prettyBytes(dfResult.available)}`);
 }
 
 function hasChownSupportSync(apiConfig) {