Time Machine vs Mac HD

[dave92029]

I just set up Time machine. It appears that the external HD with Time machine has 38.2 GB of usage and my iMac HD has 41.07 Gb of usage.

Anyone know what the 2.87 Gb difference is between the Time machine usage and the iMac HD?

Thanks

 

[stridemat]

Do you have anything excluded from the TM backup?

 

[dave92029]

Not smart enough yet to exclude anything

Do you have anything excluded from the TM backup?

Not that I'm aware of. I don't even know how i would exclude anything.

I simply plugged in the external HD and then activated TM.

 

[stridemat]

OK lets have a look too make sure.

Open Time Machine preferences from System Preferences. Now click options. Is anything in this box?

 

[dave92029]

No exclusions

Only Time Machine backup is shown

 

[stridemat]

hmmmm Im out of ideas. I have even tried 'googleing' it but I can't find any answers. Hopefully someone else might have some bright ideas.

 

[dave92029]

Thank you

hmmmm Im out of ideas. I have even tried 'googleing' it but I can't find any answers. Hopefully someone else might have some bright ideas.

Thanks for trying to assist me.

 

[himansk]

Some of that could be attributed to caches and swap files which are not backed up to time machine

 

[Warbitrary]

If you are using Transmission (BitTorrent software), I think it automatically excludes downloads in progress (because they change constantly).

Also, what is the "Estimated size of full backup" in the Options dialog box?

 

[dave92029]

Full size of backup is more confusing - to me

If you are using Transmission (BitTorrent software), I think it automatically excludes downloads in progress (because they change constantly).

Also, what is the "Estimated size of full backup" in the Options dialog box?

The Estimated size of Full backup is 44.05GB vs 41.07 on Mac HD vs 38.2 on Time Machine ????

 

[Ochaye]

Time Machine vs Mac HD

I just set up Time machine. It appears that the external HD with Time machine has 38.2 GB of usage and my iMac HD has 41.07 Gb of usage.

Anyone know what the 2.87 Gb difference is between the Time machine usage and the iMac HD?

I don't know, but I'd like to wager a guess:

41.07 GB = 38.22 GiB,

where 1 GB = 1000^3 bytes = 10^9 bytes,
while 1 GiB = 1024^3 bytes = 1073741824 bytes.
See

http://en.wikipedia.org/wiki/Gibibyte

In the transition from Leopard to Snow Leopard, the binary system
has been replaced by the base-10 numeral system (see

http://www.macfanatic.net/blog/2009/08/28/snow-leopard-gb-vs-gib/

).

 

[dave92029]

Anyone else experiencing similar differences?

What readings are others showing on iStat?

Thanks for everyones input.

 

[TuffLuffJimmy]

I don't know, but I'd like to wager a guess:

41.07 GB = 38.22 GiB,

where 1 GB = 1000^3 bytes = 10^9 bytes,
while 1 GiB = 1024^3 bytes = 1073741824 bytes.
See

http://en.wikipedia.org/wiki/Gibibyte

In the transition from Leopard to Snow Leopard, the binary system
has been replaced by the base-10 numeral system (see

http://www.macfanatic.net/blog/2009/08/28/snow-leopard-gb-vs-gib/

).

That would be obnoxiously annoying of Apple to do that.

 

[VanNess]

Time machine backs up almost everything - but not quite.

By default, Time Machine excludes files that aren't practical to back up, such as cache files, etc., that wouldn't be useful to restore. Whether the default exclusions in your case amount to almost 3 gigs is another matter.