If I want a backup block device (bytes array), can it support it?

[zhuxiujia]

If I want a backup block device (bytes array), can it support it?

• maybe need change and restore params(source: PathList tosource: FileSystem ) ?

pub fn backup(
        &self,
        opts: &BackupOptions,
        source: PathList,
        snap: SnapshotFile,
    ) -> RusticResult<SnapshotFile> {
        commands::backup::backup(self, opts, source, snap)
    }