On 2016-04-26, at 7:47 AM, Geoffrey Odhner <geoff...@odhner.net> wrote:

> I wish what you say were true, but Time Machine eventually can get to a point 
> where it requires you to delete everything or start a new backup volume.  
> This can happen when its size is considerably larger than the size of the 
> drive it's backing up.  I know this because it has happened to me.  When it 
> reaches that point it doesn't allow you to make ANY other changes, including 
> deleting directories in the backup that you could do without.  I exclude 
> /opt/local from backups, along with other folders that can be readily 
> reconstructed so that I won't run into this problem again.

How long ago was that? 

I've managed to delete stuff from the only existing backup in 1.7.10.
And, I discovered that if you change the "what is backed up" to only a single 
small partition, Time Machine will happily back that up, and then the other 
backup is now no longer the latest and should be deleteable.

(I did that to force a full re-backup, when I had reasons to distrust the 
completeness of the existing backup.)

> 
> Regards,
> 
> Geoff Odhner
>> On 4/26/2016 9:30:57 AM, Bachsau <w...@bachsau.name> wrote:
>> 
>> 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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