how big external drive

puckhead193

macrumors G3
Original poster
May 25, 2004
9,245
470
NY
How big of a hard drive should one get for using with time machine? Obv. at least your HDD if not double correct? My brother doesn't have an external drive and i think his PM g5 has a 160 GB hdd so if i double it like 350+ correct?
 

cmaier

macrumors P6
Jul 25, 2007
16,054
12,261
California
How big of a hard drive should one get for using with time machine? Obv. at least your HDD if not double correct? My brother doesn't have an external drive and i think his PM g5 has a 160 GB hdd so if i double it like 350+ correct?
Doesn't have to be double, but at least the same size. Depends on how many old dailies/weeklies/monthlies you want to store, how you use your machine, etc.

For a 160, a 250 would probably be more than enough for most people.
 

CalBoy

macrumors 604
May 21, 2007
7,849
37
It really depends more on how much of your HD is filled, and how often you add new larger files. For example, someone might be using only 40GB right now, but if they add or edit new files of 100MB everyday, then Time Machine will need ~3GB/month, or 36GB/year. Add the 40 from the base, and the total is above 76GB. Now take into account how long drives normally last. Since most externals can be expected to last about 4 years or so (depending on how you run them and the quality), it would be wise to get an external that is at least 188GB (the amount that would be used in storage after 4 years). Seeing as how some space is lost due to the whole 1024 v 1000 conversion, a 250GB would probably be best. Again, this is for a hypothetical person. Find out what your brother's needs are and decided accordingly.
 
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