Time Machine vs Mac HD

dave92029

macrumors member
Original poster
Dec 8, 2008
52
0
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. :eek:

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

Thanks
 

dave92029

macrumors member
Original poster
Dec 8, 2008
52
0
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. :D
 
Comment

stridemat

Moderator
Staff member
Apr 2, 2008
11,180
595
UK
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.
 
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himansk

macrumors regular
Oct 16, 2006
221
0
Some of that could be attributed to caches and swap files which are not backed up to time machine
 
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Warbitrary

macrumors regular
Nov 24, 2009
212
0
Montréal, Canada
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?
 
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dave92029

macrumors member
Original poster
Dec 8, 2008
52
0
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 ????:confused:
 
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Ochaye

macrumors newbie
Dec 1, 2009
1
0
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
HTML:
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has been replaced by the base-10 numeral system (see
HTML:
http://www.macfanatic.net/blog/2009/08/28/snow-leopard-gb-vs-gib/
).
 
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dave92029

macrumors member
Original poster
Dec 8, 2008
52
0
Anyone else experiencing similar differences?

What readings are others showing on iStat?

Thanks for everyones input.
 
Comment

TuffLuffJimmy

macrumors G3
Apr 6, 2007
9,000
25
Portland, OR
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
HTML:
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
HTML:
http://www.macfanatic.net/blog/2009/08/28/snow-leopard-gb-vs-gib/
).
That would be obnoxiously annoying of Apple to do that.
 
Comment

VanNess

macrumors 6502a
Mar 31, 2005
898
150
California
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.
 
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