[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2917: `tahoe backup` could easily report size information about the backup performed

[Tahoe-LAFS]

#2917: `tahoe backup` could easily report size information about the backup
performed
-------------------------------+---------------------------
 Reporter:  exarkun            |          Owner:
     Type:  enhancement        |         Status:  new
 Priority:  normal             |      Milestone:  undecided
Component:  code-frontend-cli  |        Version:  1.12.1
 Keywords:  tahoe-backup       |  Launchpad Bug:
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 As a backup is progressing, information about how much data is being
 backed up is readily available.  There are a few different sizes which can
 be considered:

   * size of the local files being backed up
   * size of the files which don't already exist in a backup and need to be
 stored
   * size of all backup versions of this data set

 Application-data-size vs Tahoe-LAFS-storage-commitment provides another
 dimension to this data, as well.

 It would be great if `tahoe backup` could report some or all of these
 sizes.

 Some of this information could also factor into improved progress
 reporting (reporting by bytes transferred may provide a more accurate
 indication of progress than reporting by number of files transferred).

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2917>
Tahoe-LAFS <https://Tahoe-LAFS.org>
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