René J.V. Bertin wrote on 26.04.2016 13:19:
Superfluous backing up of course ends up wasting significant amount of space on 
the backup disk esp. for developers who regularly to something like `port -n 
upgrade --force` after an incremental rebuild with only minimal changes. It is 
also costly in terms of time when you're using a NAS like my Time Capsule (even 
when connected via a wired gigabit connection).

In default configuration time machine will automatically discard old backups in favor of new ones, so there shouldn't be any space problems ever.

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