diff --git a/src/restic/backend/id.go b/src/restic/backend/id.go
index a37e0edea..2714ee63e 100644
--- a/src/restic/backend/id.go
+++ b/src/restic/backend/id.go
@@ -25,7 +25,7 @@ func ParseID(s string) (ID, error) {
 	b, err := hex.DecodeString(s)
 
 	if err != nil {
-		return ID{}, err
+		return ID{}, errors.Wrap(err, "hex.DecodeString")
 	}
 
 	if len(b) != IDSize {
@@ -73,7 +73,7 @@ func (id ID) Equal(other ID) bool {
 func (id ID) EqualString(other string) (bool, error) {
 	s, err := hex.DecodeString(other)
 	if err != nil {
-		return false, err
+		return false, errors.Wrap(err, "hex.DecodeString")
 	}
 
 	id2 := ID{}
@@ -97,12 +97,12 @@ func (id *ID) UnmarshalJSON(b []byte) error {
 	var s string
 	err := json.Unmarshal(b, &s)
 	if err != nil {
-		return err
+		return errors.Wrap(err, "Unmarshal")
 	}
 
 	_, err = hex.Decode(id[:], []byte(s))
 	if err != nil {
-		return err
+		return errors.Wrap(err, "hex.Decode")
 	}
 
 	return nil
diff --git a/src/restic/backend/local/local.go b/src/restic/backend/local/local.go
index 078f21ad5..c51ee949b 100644
--- a/src/restic/backend/local/local.go
+++ b/src/restic/backend/local/local.go
@@ -35,7 +35,7 @@ func Open(dir string) (*Local, error) {
 	// test if all necessary dirs are there
 	for _, d := range paths(dir) {
 		if _, err := fs.Stat(d); err != nil {
-			return nil, errors.Errorf("%s does not exist", d)
+			return nil, errors.Wrap(err, "Open")
 		}
 	}
 
@@ -55,7 +55,7 @@ func Create(dir string) (*Local, error) {
 	for _, d := range paths(dir) {
 		err := fs.MkdirAll(d, backend.Modes.Dir)
 		if err != nil {
-			return nil, err
+			return nil, errors.Wrap(err, "MkdirAll")
 		}
 	}
 
@@ -110,13 +110,13 @@ func (b *Local) Load(h backend.Handle, p []byte, off int64) (n int, err error) {
 
 	f, err := fs.Open(filename(b.p, h.Type, h.Name))
 	if err != nil {
-		return 0, err
+		return 0, errors.Wrap(err, "Open")
 	}
 
 	defer func() {
 		e := f.Close()
 		if err == nil && e != nil {
-			err = e
+			err = errors.Wrap(e, "Close")
 		}
 	}()
 
@@ -128,7 +128,7 @@ func (b *Local) Load(h backend.Handle, p []byte, off int64) (n int, err error) {
 	}
 
 	if err != nil {
-		return 0, err
+		return 0, errors.Wrap(err, "Seek")
 	}
 
 	return io.ReadFull(f, p)
@@ -138,12 +138,12 @@ func (b *Local) Load(h backend.Handle, p []byte, off int64) (n int, err error) {
 func writeToTempfile(tempdir string, p []byte) (filename string, err error) {
 	tmpfile, err := ioutil.TempFile(tempdir, "temp-")
 	if err != nil {
-		return "", err
+		return "", errors.Wrap(err, "TempFile")
 	}
 
 	n, err := tmpfile.Write(p)
 	if err != nil {
-		return "", err
+		return "", errors.Wrap(err, "Write")
 	}
 
 	if n != len(p) {
@@ -151,17 +151,17 @@ func writeToTempfile(tempdir string, p []byte) (filename string, err error) {
 	}
 
 	if err = tmpfile.Sync(); err != nil {
-		return "", err
+		return "", errors.Wrap(err, "Syncn")
 	}
 
 	err = fs.ClearCache(tmpfile)
 	if err != nil {
-		return "", err
+		return "", errors.Wrap(err, "ClearCache")
 	}
 
 	err = tmpfile.Close()
 	if err != nil {
-		return "", err
+		return "", errors.Wrap(err, "Close")
 	}
 
 	return tmpfile.Name(), nil
@@ -191,7 +191,7 @@ func (b *Local) Save(h backend.Handle, p []byte) (err error) {
 	if h.Type == backend.Data {
 		err = fs.MkdirAll(filepath.Dir(filename), backend.Modes.Dir)
 		if err != nil {
-			return err
+			return errors.Wrap(err, "MkdirAll")
 		}
 	}
 
@@ -200,13 +200,13 @@ func (b *Local) Save(h backend.Handle, p []byte) (err error) {
 		h, filepath.Base(tmpfile), filepath.Base(filename), err)
 
 	if err != nil {
-		return err
+		return errors.Wrap(err, "Rename")
 	}
 
 	// set mode to read-only
 	fi, err := fs.Stat(filename)
 	if err != nil {
-		return err
+		return errors.Wrap(err, "Stat")
 	}
 
 	return setNewFileMode(filename, fi)
@@ -221,7 +221,7 @@ func (b *Local) Stat(h backend.Handle) (backend.BlobInfo, error) {
 
 	fi, err := fs.Stat(filename(b.p, h.Type, h.Name))
 	if err != nil {
-		return backend.BlobInfo{}, err
+		return backend.BlobInfo{}, errors.Wrap(err, "Stat")
 	}
 
 	return backend.BlobInfo{Size: fi.Size()}, nil
@@ -235,7 +235,7 @@ func (b *Local) Test(t backend.Type, name string) (bool, error) {
 		if os.IsNotExist(errors.Cause(err)) {
 			return false, nil
 		}
-		return false, err
+		return false, errors.Wrap(err, "Stat")
 	}
 
 	return true, nil
@@ -249,7 +249,7 @@ func (b *Local) Remove(t backend.Type, name string) error {
 	// reset read-only flag
 	err := fs.Chmod(fn, 0666)
 	if err != nil {
-		return err
+		return errors.Wrap(err, "Chmod")
 	}
 
 	return fs.Remove(fn)
@@ -262,13 +262,13 @@ func isFile(fi os.FileInfo) bool {
 func readdir(d string) (fileInfos []os.FileInfo, err error) {
 	f, e := fs.Open(d)
 	if e != nil {
-		return nil, e
+		return nil, errors.Wrap(e, "Open")
 	}
 
 	defer func() {
 		e := f.Close()
 		if err == nil {
-			err = e
+			err = errors.Wrap(e, "Close")
 		}
 	}()
 
diff --git a/src/restic/backend/rest/config.go b/src/restic/backend/rest/config.go
index 61a73144a..e59031071 100644
--- a/src/restic/backend/rest/config.go
+++ b/src/restic/backend/rest/config.go
@@ -22,7 +22,7 @@ func ParseConfig(s string) (interface{}, error) {
 	u, err := url.Parse(s)
 
 	if err != nil {
-		return nil, err
+		return nil, errors.Wrap(err, "url.Parse")
 	}
 
 	cfg := Config{URL: u}
diff --git a/src/restic/backend/rest/rest.go b/src/restic/backend/rest/rest.go
index 635c2f4c5..a98fd5a80 100644
--- a/src/restic/backend/rest/rest.go
+++ b/src/restic/backend/rest/rest.go
@@ -80,7 +80,7 @@ func (b *restBackend) Load(h backend.Handle, p []byte, off int64) (n int, err er
 	if off < 0 {
 		info, err := b.Stat(h)
 		if err != nil {
-			return 0, err
+			return 0, errors.Wrap(err, "Stat")
 		}
 
 		if -off > info.Size {
@@ -92,7 +92,7 @@ func (b *restBackend) Load(h backend.Handle, p []byte, off int64) (n int, err er
 
 	req, err := http.NewRequest("GET", restPath(b.url, h), nil)
 	if err != nil {
-		return 0, err
+		return 0, errors.Wrap(err, "http.NewRequest")
 	}
 	req.Header.Add("Range", fmt.Sprintf("bytes=%d-%d", off, off+int64(len(p))))
 	<-b.connChan
@@ -104,13 +104,13 @@ func (b *restBackend) Load(h backend.Handle, p []byte, off int64) (n int, err er
 			e := resp.Body.Close()
 
 			if err == nil {
-				err = e
+				err = errors.Wrap(e, "Close")
 			}
 		}()
 	}
 
 	if err != nil {
-		return 0, err
+		return 0, errors.Wrap(err, "client.Do")
 	}
 	if resp.StatusCode != 200 && resp.StatusCode != 206 {
 		return 0, errors.Errorf("unexpected HTTP response code %v", resp.StatusCode)
@@ -134,13 +134,13 @@ func (b *restBackend) Save(h backend.Handle, p []byte) (err error) {
 			e := resp.Body.Close()
 
 			if err == nil {
-				err = e
+				err = errors.Wrap(e, "Close")
 			}
 		}()
 	}
 
 	if err != nil {
-		return err
+		return errors.Wrap(err, "client.Post")
 	}
 
 	if resp.StatusCode != 200 {
@@ -160,11 +160,11 @@ func (b *restBackend) Stat(h backend.Handle) (backend.BlobInfo, error) {
 	resp, err := b.client.Head(restPath(b.url, h))
 	b.connChan <- struct{}{}
 	if err != nil {
-		return backend.BlobInfo{}, err
+		return backend.BlobInfo{}, errors.Wrap(err, "client.Head")
 	}
 
 	if err = resp.Body.Close(); err != nil {
-		return backend.BlobInfo{}, err
+		return backend.BlobInfo{}, errors.Wrap(err, "Close")
 	}
 
 	if resp.StatusCode != 200 {
@@ -201,14 +201,14 @@ func (b *restBackend) Remove(t backend.Type, name string) error {
 
 	req, err := http.NewRequest("DELETE", restPath(b.url, h), nil)
 	if err != nil {
-		return err
+		return errors.Wrap(err, "http.NewRequest")
 	}
 	<-b.connChan
 	resp, err := b.client.Do(req)
 	b.connChan <- struct{}{}
 
 	if err != nil {
-		return err
+		return errors.Wrap(err, "client.Do")
 	}
 
 	if resp.StatusCode != 200 {
diff --git a/src/restic/backend/s3/config.go b/src/restic/backend/s3/config.go
index 70991363d..4eda2b0e8 100644
--- a/src/restic/backend/s3/config.go
+++ b/src/restic/backend/s3/config.go
@@ -32,7 +32,7 @@ func ParseConfig(s string) (interface{}, error) {
 		// bucket name and prefix
 		url, err := url.Parse(s[3:])
 		if err != nil {
-			return nil, err
+			return nil, errors.Wrap(err, "url.Parse")
 		}
 
 		if url.Path == "" {
diff --git a/src/restic/backend/s3/s3.go b/src/restic/backend/s3/s3.go
index 6da9cac47..835a7c485 100644
--- a/src/restic/backend/s3/s3.go
+++ b/src/restic/backend/s3/s3.go
@@ -30,7 +30,7 @@ func Open(cfg Config) (backend.Backend, error) {
 
 	client, err := minio.New(cfg.Endpoint, cfg.KeyID, cfg.Secret, !cfg.UseHTTP)
 	if err != nil {
-		return nil, err
+		return nil, errors.Wrap(err, "minio.New")
 	}
 
 	be := &s3{client: client, bucketname: cfg.Bucket, prefix: cfg.Prefix}
@@ -39,14 +39,14 @@ func Open(cfg Config) (backend.Backend, error) {
 	ok, err := client.BucketExists(cfg.Bucket)
 	if err != nil {
 		debug.Log("s3.Open", "BucketExists(%v) returned err %v, trying to create the bucket", cfg.Bucket, err)
-		return nil, err
+		return nil, errors.Wrap(err, "client.BucketExists")
 	}
 
 	if !ok {
 		// create new bucket with default ACL in default region
 		err = client.MakeBucket(cfg.Bucket, "")
 		if err != nil {
-			return nil, err
+			return nil, errors.Wrap(err, "client.MakeBucket")
 		}
 	}
 
@@ -95,20 +95,20 @@ func (be s3) Load(h backend.Handle, p []byte, off int64) (n int, err error) {
 	obj, err = be.client.GetObject(be.bucketname, path)
 	if err != nil {
 		debug.Log("s3.Load", "  err %v", err)
-		return 0, err
+		return 0, errors.Wrap(err, "client.GetObject")
 	}
 
 	// make sure that the object is closed properly.
 	defer func() {
 		e := obj.Close()
 		if err == nil {
-			err = e
+			err = errors.Wrap(e, "Close")
 		}
 	}()
 
 	info, err := obj.Stat()
 	if err != nil {
-		return 0, err
+		return 0, errors.Wrap(err, "obj.Stat")
 	}
 
 	// handle negative offsets
@@ -179,7 +179,7 @@ func (be s3) Save(h backend.Handle, p []byte) (err error) {
 	n, err := be.client.PutObject(be.bucketname, path, bytes.NewReader(p), "binary/octet-stream")
 	debug.Log("s3.Save", "%v -> %v bytes, err %#v", path, n, err)
 
-	return err
+	return errors.Wrap(err, "client.PutObject")
 }
 
 // Stat returns information about a blob.
@@ -192,21 +192,21 @@ func (be s3) Stat(h backend.Handle) (bi backend.BlobInfo, err error) {
 	obj, err = be.client.GetObject(be.bucketname, path)
 	if err != nil {
 		debug.Log("s3.Stat", "GetObject() err %v", err)
-		return backend.BlobInfo{}, err
+		return backend.BlobInfo{}, errors.Wrap(err, "client.GetObject")
 	}
 
 	// make sure that the object is closed properly.
 	defer func() {
 		e := obj.Close()
 		if err == nil {
-			err = e
+			err = errors.Wrap(e, "Close")
 		}
 	}()
 
 	fi, err := obj.Stat()
 	if err != nil {
 		debug.Log("s3.Stat", "Stat() err %v", err)
-		return backend.BlobInfo{}, err
+		return backend.BlobInfo{}, errors.Wrap(err, "Stat")
 	}
 
 	return backend.BlobInfo{Size: fi.Size}, nil
@@ -230,7 +230,7 @@ func (be *s3) Remove(t backend.Type, name string) error {
 	path := be.s3path(t, name)
 	err := be.client.RemoveObject(be.bucketname, path)
 	debug.Log("s3.Remove", "%v %v -> err %v", t, name, err)
-	return err
+	return errors.Wrap(err, "client.RemoveObject")
 }
 
 // List returns a channel that yields all names of blobs of type t. A
diff --git a/src/restic/backend/sftp/config.go b/src/restic/backend/sftp/config.go
index 39609e346..d8e200491 100644
--- a/src/restic/backend/sftp/config.go
+++ b/src/restic/backend/sftp/config.go
@@ -26,7 +26,7 @@ func ParseConfig(s string) (interface{}, error) {
 		// parse the "sftp://user@host/path" url format
 		url, err := url.Parse(s)
 		if err != nil {
-			return nil, err
+			return nil, errors.Wrap(err, "url.Parse")
 		}
 		if url.User != nil {
 			user = url.User.Username()
diff --git a/src/restic/backend/sftp/sftp.go b/src/restic/backend/sftp/sftp.go
index 43806d24c..c82e29683 100644
--- a/src/restic/backend/sftp/sftp.go
+++ b/src/restic/backend/sftp/sftp.go
@@ -41,7 +41,7 @@ func startClient(program string, args ...string) (*SFTP, error) {
 	// prefix the errors with the program name
 	stderr, err := cmd.StderrPipe()
 	if err != nil {
-		return nil, err
+		return nil, errors.Wrap(err, "cmd.StderrPipe")
 	}
 
 	go func() {
@@ -57,16 +57,16 @@ func startClient(program string, args ...string) (*SFTP, error) {
 	// get stdin and stdout
 	wr, err := cmd.StdinPipe()
 	if err != nil {
-		return nil, err
+		return nil, errors.Wrap(err, "cmd.StdinPipe")
 	}
 	rd, err := cmd.StdoutPipe()
 	if err != nil {
-		return nil, err
+		return nil, errors.Wrap(err, "cmd.StdoutPipe")
 	}
 
 	// start the process
 	if err := cmd.Start(); err != nil {
-		return nil, err
+		return nil, errors.Wrap(err, "cmd.Start")
 	}
 
 	// wait in a different goroutine
@@ -74,7 +74,7 @@ func startClient(program string, args ...string) (*SFTP, error) {
 	go func() {
 		err := cmd.Wait()
 		debug.Log("sftp.Wait", "ssh command exited, err %v", err)
-		ch <- err
+		ch <- errors.Wrap(err, "cmd.Wait")
 	}()
 
 	// open the SFTP session
@@ -182,7 +182,7 @@ func Create(dir string, program string, args ...string) (*SFTP, error) {
 
 	err = sftp.Close()
 	if err != nil {
-		return nil, err
+		return nil, errors.Wrap(err, "Close")
 	}
 
 	// open backend
@@ -274,16 +274,17 @@ func (r *SFTP) renameFile(oldname string, t backend.Type, name string) error {
 
 	err := r.c.Rename(oldname, filename)
 	if err != nil {
-		return err
+		return errors.Wrap(err, "Rename")
 	}
 
 	// set mode to read-only
 	fi, err := r.c.Lstat(filename)
 	if err != nil {
-		return err
+		return errors.Wrap(err, "Lstat")
 	}
 
-	return r.c.Chmod(filename, fi.Mode()&os.FileMode(^uint32(0222)))
+	err = r.c.Chmod(filename, fi.Mode()&os.FileMode(^uint32(0222)))
+	return errors.Wrap(err, "Chmod")
 }
 
 // Join joins the given paths and cleans them afterwards. This always uses
@@ -336,13 +337,13 @@ func (r *SFTP) Load(h backend.Handle, p []byte, off int64) (n int, err error) {
 
 	f, err := r.c.Open(r.filename(h.Type, h.Name))
 	if err != nil {
-		return 0, err
+		return 0, errors.Wrap(err, "Open")
 	}
 
 	defer func() {
 		e := f.Close()
 		if err == nil && e != nil {
-			err = e
+			err = errors.Wrap(e, "Close")
 		}
 	}()
 
@@ -354,7 +355,7 @@ func (r *SFTP) Load(h backend.Handle, p []byte, off int64) (n int, err error) {
 	}
 
 	if err != nil {
-		return 0, err
+		return 0, errors.Wrap(err, "Seek")
 	}
 
 	return io.ReadFull(f, p)
@@ -380,7 +381,7 @@ func (r *SFTP) Save(h backend.Handle, p []byte) (err error) {
 
 	n, err := tmpfile.Write(p)
 	if err != nil {
-		return err
+		return errors.Wrap(err, "Write")
 	}
 
 	if n != len(p) {
@@ -389,17 +390,13 @@ func (r *SFTP) Save(h backend.Handle, p []byte) (err error) {
 
 	err = tmpfile.Close()
 	if err != nil {
-		return err
+		return errors.Wrap(err, "Close")
 	}
 
 	err = r.renameFile(filename, h.Type, h.Name)
 	debug.Log("sftp.Save", "save %v: rename %v: %v",
 		h, path.Base(filename), err)
-	if err != nil {
-		return errors.Errorf("sftp: renameFile: %v", err)
-	}
-
-	return nil
+	return err
 }
 
 // Stat returns information about a blob.
@@ -415,7 +412,7 @@ func (r *SFTP) Stat(h backend.Handle) (backend.BlobInfo, error) {
 
 	fi, err := r.c.Lstat(r.filename(h.Type, h.Name))
 	if err != nil {
-		return backend.BlobInfo{}, err
+		return backend.BlobInfo{}, errors.Wrap(err, "Lstat")
 	}
 
 	return backend.BlobInfo{Size: fi.Size()}, nil
@@ -434,7 +431,7 @@ func (r *SFTP) Test(t backend.Type, name string) (bool, error) {
 	}
 
 	if err != nil {
-		return false, err
+		return false, errors.Wrap(err, "Lstat")
 	}
 
 	return true, nil
diff --git a/src/restic/backend/utils.go b/src/restic/backend/utils.go
index 01446a78c..9bd87b4fb 100644
--- a/src/restic/backend/utils.go
+++ b/src/restic/backend/utils.go
@@ -13,7 +13,7 @@ import (
 func LoadAll(be Backend, h Handle, buf []byte) ([]byte, error) {
 	fi, err := be.Stat(h)
 	if err != nil {
-		return nil, err
+		return nil, errors.Wrap(err, "Stat")
 	}
 
 	if fi.Size > int64(len(buf)) {