diff --git a/backend/cache/cache.go b/backend/cache/cache.go
index 8b1263cad..98ebe79b0 100644
--- a/backend/cache/cache.go
+++ b/backend/cache/cache.go
@@ -520,9 +520,6 @@ func NewFs(name, rootPath string, m configmap.Mapper) (fs.Fs, error) {
 	// override only those features that use a temp fs and it doesn't support them
 	//f.features.ChangeNotify = f.ChangeNotify
 	if f.opt.TempWritePath != "" {
-		if f.tempFs.Features().Copy == nil {
-			f.features.Copy = nil
-		}
 		if f.tempFs.Features().Move == nil {
 			f.features.Move = nil
 		}
@@ -1533,6 +1530,9 @@ func (f *Fs) Copy(ctx context.Context, src fs.Object, remote string) (fs.Object,
 		fs.Errorf(src, "source remote (%v) doesn't support Copy", src.Fs())
 		return nil, fs.ErrorCantCopy
 	}
+	if f.opt.TempWritePath != "" && src.Fs() == f.tempFs {
+		return nil, fs.ErrorCantCopy
+	}
 	// the source must be a cached object or we abort
 	srcObj, ok := src.(*Object)
 	if !ok {
diff --git a/cmd/backend/backend.go b/cmd/backend/backend.go
index 2d32ff447..12c5a3f33 100644
--- a/cmd/backend/backend.go
+++ b/cmd/backend/backend.go
@@ -59,7 +59,7 @@ Note to run these commands on a running backend then see
 [backend/command](/rc/#backend/command) in the rc docs.
 `,
 	RunE: func(command *cobra.Command, args []string) error {
-		cmd.CheckArgs(2, 1E6, command, args)
+		cmd.CheckArgs(2, 1e6, command, args)
 		name, remote := args[0], args[1]
 		cmd.Run(false, false, command, func() error {
 			// show help if remote is a backend name