Time machine space questions, not the same as Activity Monitor

Hello
I am new here and kindly ask your thoughts on what I am seeing.
I have a 13" MacBook Pro early 2011 with OS 10.7.5
Earlier this year I tried an upgrade to a new OS and experienced a failure that required me to make a visit to the Apple store.
I believe they reinstalled the OS and if I remember correctly I just did a recovery with the Time Machine backup I had.
While that backup was not very recent, yea OK I get that was stupid, what was odd was that not all my files were backed up.
I lost a significant number of files from April 2013 until the time of the failure in 2014, for reasons I have no clue as to why.
My Time Machine does not have any excluded files as far as I can tell.
So my first question is: Can anyone help me understand what may have happened and how to counter that?
Then yesterday I decided to invest in a new backup external drive.
During the process of setting it up and doing the 1st Time Machine backup on that, I noticed the following:
In Activity Monitor under the "Disk Usage" tab shows the Macintosh HD as using 258 of 319 GB, and then selecting my user name it shows using 578 of 639 GB.
When I did the backup with Time Machine it backed up approximately 250GB.
I thought Time Machine backed up the entire HD.
What is the difference between the Macintosh HD space and the user space in terms of usage and total?
Should I be worried or visiting the Apple store again?

OK, done.
I created a text.txt document containing the words "Version 0". I saved it to the Desktop, closed it and selected "Back Up Now" from the Finder.
Waited for that to complete, opened the test.txt document again, modified it by adding the words "Version 1", saved it, closed it and selected "Back Up Now" again.
Repeated that twice more, so the end result was a Text.txt containing the words "Version 0", "Version 1", "Version 2", and "Version 3".
I expect that I should now have three versions from which to choose to restore, all from different times, plus the latest one still on the Desktop.
Creation and backups now complete, so the next step was restoration:
From the Finder, I used "Enter Time Machine" and verified that I had four different recent times from which to choose. I chose the original text.txt document and elected to "keep both files". It restored the original, which I opened and verified it contained nothing but the text "Version 0".
I repeated this for the subsequent version. I opened that one and confirmed it contained the words "Version 1".
I repeated this for the subsequent version. Now I have three restored text.txt documents, plus the one on the Desktop.
I opened all four text.txt documents and stacked them as shown in the following screenshot:
Conclusion, no surprises that I can determine.
Is this what you had in mind, or was there something I did that was different from what you need?

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Is it possible to make 2 time machine back-ups on the same disk

Hi, i have 2 MacBook Pros, I have a time machine back-up for the newer one on my 500GB hard drive
I went to boot camp my other mac and it says I have to format the hard-drive, so I want to back everything on the old mac up, is it possible to make a seperate time machine back-up on the same external hard drive as I don't want to overwrite the back-up for my new mac? How can I do this
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andy.lawrence wrote:
you might have mentioned this before, but once I have partitioned my external drive, how can I go about re-formatting the old mac hard drive and then restoring my data back onto it?
You don't have to re-format it first; you need to erase and restore to "pack" everything into the first part of the drive so there's enough room on the rest of it for +Boot Camp+ to make a partition.
See #14 in [Time Machine - Frequently Asked Questions|http://web.me.com/pondini/Time_Machine/FAQ.html] (or use the link in *User Tips* at the top of this forum).
Then use +Boot Camp+ to make the second partition.
Also, would it be better to run the OS X install disc, re-format the hard drive, and then when running setup assistant migrate all my information from the time machine back-up?
No. You'd have to install OSX, then use +Setup Assistant,+ then download and install the "combo" update (and other updates) to get back to the version of OSX you're running. And you might have to re-authorize and/or reinstall some 3rd-party apps.
If i do this, at the moment Im running snow leopard but the install disc is simply leopard, will this matter once I've migrated all my data across?
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Hey apple_peeler,
Thanks for using Apple Support Communities.
It sounds like you want to find out what is now missing by comparing it with other backups. The Restoring data from Time Machine backups section explains how you can do that.
Mac Basics: Time Machine backs up your Mac
http://support.apple.com/kb/HT1427
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Time Machine couldn't complete the backup to "Time Capsule. The backup disk image /Volumes/Data/MacBook Pro.sparsebundle could not be created (error 60)"

We are Mountain Lion using Time Machine to backup to Time Capsule. When the backup tries to run, an error appears after a couple of minutes saying "The disk you inserted was not readable by this computer." Then an error shows up saying "Time Machine couldn't complete the backup to "Time Capsule.The backup disk image /Volumes/Data/MacBook Pro.sparsebundle could not be created (error 60)"
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neillhowell wrote:
I've noticed that when Time Machine runs, that a folder called Data at /Volumes/ appears while Time Machine is trying to back up. I think it's making the sparsebundle to transfer to the Time Capsule.
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Via the Finder, locate the existing sparse bundle (see the pink box in Time Machine - Frequently Asked Question #17 if you're not sure how to do that). See how large it is (plus how large anything else that may be there). If the total is very near the size of the TC, that may be the problem.
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hi my computer entire hard drive is 2TB and only 1Tb used. and my external hard drive(time machine back-up) is 2TB. and right now Time machine back up failed. and keep saying that hard drive don;t have enough space....
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What's shown for +Estimated size of full backup+ under the exclusions box in TM Preferences > Options?
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Time machine space questions, not the same as Activity Monitor

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