How much Minimum Disk Space is Required for Time Machine?

Are there any recommendations from Apple for the size of external hard drive for Time Machine?
Also, is there any formula for the amount of hard drive space = how any days, months, or years of backup available?
Sorry about the poorly worded question.

Size of HD = IBS + [30*DCD + 487*DCD]NM
or
Size of HD = IBS + 365NMDCD
where
IBS = Initial Backup Size (GBs)
NM = Number of Months wanted before HD fills
DCD = Daily Churn Data in GBs
So lets say
IBS=160 GB
NM=24 (2 years wanted before having to worry about disk full)
DCD=0.05 GB of daily churned data on average (50 MB of changed and new data)
Size of HD = 160 + 365240.05 = 598 GB
If you wanted just NM = 12 then the HD size should be around 350 to 400 GB
Much depends on how many months you want to go before being bothered with disk full and how much average daily data churn you have.
Note that TM will make much effort to clean up old data that can be safely deleted before giving up when disk becomes full. It will also provide you with the opportunity to clean up old backups yourself to free up space.
Of course you can always re-format the TM backup HD and start over again but you obviously lose your TM backup history. You can also to decide you can delete the oldest 6 months of data and keep the more recent history to continue on with thr freed up disk space.

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As a rule of thumb for HDV editing, use those numbers:
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JG!
Whew, am I blushing! I totally missed the FAQ-I just came to the forums and started searching for the answer and just blew by the FAQ. My aplogies. Thanks for directing me that way. I appreciate it.
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Reg: how much hard disk space required?

hi expert's
i am planning to install netweaver(bi 7) in my desktop pc. so how much hard disk space is required for this. what are all the hardware requirements needed?
regards
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Sorry, the Missing Manuel for Lion isn't available until the end of the month, but I have a lot of basic questions.
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How do I see how much free disk space I have?

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Well, you should see something like this:
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Repair the Hard Drive and Permissions - Lion
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How much free disk space after setup

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Perhaps blocking?
Take a look at Adam's great stored procedure to see who is running on the server
Who Is Active? v10.00 (2010-10-21)
(C) 2007-2010, Adam Machanic
Feedback: mailto:[email protected]
Updates: http://sqlblog.com/blogs/adam_machanic/archive/tags/who+is+active/default.aspx
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License:
Who is Active? is free to download and use for personal, educational, and internal
corporate purposes, provided that this header is preserved. Redistribution or sale
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http://sqlblog.com/blogs/uri_dimant/
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How much Minimum Disk Space is Required for Time Machine?

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