Possible to shedule "Compute stats"

[ecker00]

It is mentioned briefly in #536.

It feels like in the Repo settings page "Stats policy" is missing, like prune and check currently does. Seems natural to generate these stats on a daily basis for most users, making the "Stats" tab more useful when it has consistent data to display.

[garethgeorge]

Hmm, I'm a bit opinionated that stats shouldn't be scheduled other than after a prune operation runs (which is how it's done today).

This is because after a prune is the only time that a repo's size can be expected to be somewhat consistent. Restic will have just dropped extraneous data from the repo etc. Otherwise you should expect to see a fairly spiky chart depending on how much churn there is in your dataset. The second concern is that stats operations are surprisingly expensive: they do a full traversal of the repo's index.

Open to other opinions, but I don't see a very good use case for scheduled stats separately from prune.

[ecker00]

Ah, I was not aware that was the case. As I had scheduled prune to only run once a week, so my new setup looked like it did not calculate stats first few days.

New suggestion: Include some info that it works what way, for example

<div class="ant-col ant-col-4 ant-form-item-label css-18cha1o">
  <label class="" title="">
    <span>Prune Policy</span>
  </label>
  <br />
  <span style="color: #999; font-size: 0.9em">
    (Also computes stats)
  </span>
</div>

[sumnerboy12]

In my scenario I only use Backrest as a UI/view on top of a series of restic repos I manage externally. All backups, forgetting and pruning is done outside of Backrest. But it would be nice to view the repo stats in Backrest, so I personally would be keen for a periodic "Compute Stats Policy" or the like.