Out of memory error is backup destination file is not found

### What happened?

```
> micasa backup /foo/bar
micasa: init backup: unable to open database file: out of memory (14)

> micasa backup /tmp/foo
/tmp/foo
```

### Steps to reproduce

See above

### Expected behavior

File not found error

### micasa version

dev

### Operating system

Linux

### Additional context

_No response_