retrieve future expression on local machine

Hi Henrik,

maybe that's utterly basic and the wrong place to ask, but I thought it might be of interest for more people:

Is there a way you can retrieve a future expressions in the following setup:

```
login <- tweak(remote, workers = "remote@remote")
bsub <- tweak(batchtools_lsf, ...)
plan(list(
login,
bsub,
multiprocess
))
```

and I submit the following job (just an example):

```
y %<-% furrr::future_map_dfr(1:5, function(x){
cores <- availableCores()
furrr::future_map_dfr(1:5, function(x){
tibble::tibble(x = x,
nodename = Sys.info()['nodename'],
Sys.getpid = Sys.getpid(),
availableCores = cores)
})
})
```

... let's imagine this takes an considerable amount of time and I would close my local r session in between submitting the job and its being finished.

After a login then (and rerunning the same plan again) I can't access y, neither can I access y on the remote machine in an R session. Is that possible in general?

If not, we wondered if you can save R objects somehow in an future_apply, submitted from a local machine and evaluated an a remote one?

Sorry for the very basic questions, just started to fiddle around with future.batchtools.

Cheers
Marco