better error handling

cmd/backup.go

@@ -31,7 +31,7 @@ var backupCmd = &cobra.Command{
 			location, _ := internal.GetLocation(splitted[0])
 			errs := location.Backup(false, specificBackend)
 			for _, err := range errs {
-				colors.Error.Println(err)
+				colors.Error.Printf("%s\n\n", err)
 				errors++
 			}
 		}

internal/location.go

@@ -216,7 +216,8 @@ func (l Location) Backup(cron bool, specificBackend string) []error {
 			out, err = backend.ExecDocker(l, cmd)
 		}
 		if err != nil {
-			errors = append(errors, err)
+			colors.Error.Println(out)
+			errors = append(errors, fmt.Errorf("%s@%s:\n%s%s", l.name, backend.name, out, err))
 			continue
 		}