[volunteergrid2-l] Expiring

[Zooko O'Whielacronx]

"tahoe backup" will use up almost no extra storage space if you run it
again and it backs up a bunch of files that haven't changed. At the
per-file level , unchanged files get coalesced so there's little
storage cost in running "tahoe backup" daily. Large files which change
frequently, now that's a problem -- "tahoe backup" will upload and
store the entire current version of the file every time you run it and
the file has changed.

Regards,

Zooko