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[Andrew Garner <1162014@xxxxxxxxxxxxxxxxxx>]

** Changed in: holland-backup
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1162014

Title:
  make purge more intelligent

Status in Holland Backup Framework:
  Fix Released

Bug description:
  Instead of failing a backup due to lack of disk space, it probably
  makes sense to purge old backups first.  This should be a configurable
  option but the general approach could be:

  1) estimate the space we probably will need for a backup
  2) if we don't have enough space, start killing older backups until we have space
  3) Still try anyway, and let a watchdog process abort holland if we really don't have enough space

  This can tie into more intelligent estimation methods like linear-
  extrapolation or just following the general trend of compression
  ratios, or looking at the size of the previous backups so we can
  achieve more accurate "required space" estimation.

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