Time Machine Back Up Size

I have just made a Time Machine back up to a NAS server, and so have been keeping a watch on the subsequent back-ups. I was a little suprised to see that the back-up immediatly following the initial one showed a size of over 1.5GB! There had been no significant changes made on my iMac so I just wonder why this would be so large?

oakie23 wrote:
Hi, and welcome to the forums.
I have just had my hard drive replaced and successfully restored form time machine.
That means TIme Machine's next backup will be a full one -- everything you just put on your internal HD will be backed-up again: http://support.apple.com/kb/TS1338
I then deleted a few old back ups from finder ( not a good Idea).
Correct. Your backups may be corrupted, perhaps hopelessly. Run a +*Repair DIsk+* on them per #A5 in the Time Machine - Troubleshooting *User Tip* at the top of this forum.
1. The calculated back up size is over 800gb when my hard drive is 500gb, I have excluded time machine backups.
Do you mean the figure underneath the +Do not back up+ box in TM Preferences > Options? If so, there must be something else attached to your Mac like another external HD, or perhaps you're running FileVault?
2. When I click on time machine the time machine screen default to places, desktop, how to I get it to look at my mac?
What you see there depends on how you get there. Start with a Finder window looking at, say, your home folder, before you click the TM icon in your Dock. For more detail, see #15 in the
Frequently Asked Questions *User Tip* at the top of this forum.

Similar Messages

Limit the size of time machine back ups

I would like to limit the size of my time machine back ups on time capsule. How can I do this? I am running the latest OS with the new time capsule.
Please help!!
Thanks,

Try setting the max size of the sparsebundle.
http://pondini.org/TM/A8.html

By adding an external hd to time capsule does it increase the size of available space for time machine back-ups?

By adding an external hd to time capsule does it increase the size of available space for time machine back-ups?

No, each drive is treated separately. Sorry!!

I am trying to get space on an external hard drive which has some old time machine back up files that I do not need but can not eliminate, even by going into the time machine, clicking on the backup file to be eliminated and using the drop down eliminate

I am trying to get space on an external hard drive which has some old time machine back up files that I do not need but can not eliminate, even by going into the time machine, clicking on the backup file to be eliminated and using the drop down menu with the gear box symbol to eliminate

I cannot find this 300GB "Backup" in the Finder, only in the Storage info when I check "About This Mac".
You are probably using Time Machine to backup your MacBook Pro, right? Then the additional 300 GB could be local Time Machine snapshots. Time Machine will write the hourly backups to the free space on your hard disk, if the backup drive is temporarily not connected. You do not see these local backups in the Finder, and MacOS will delete them, when you make a regular backup to Time Machine, or when you need the space for other data.
See Pondini's page for more explanation: What are Local Snapshots? http://pondini.org/TM/FAQ.html
I have restarted my computer, but the information remains the same. How do I reclaim the use of the 300GB? Why is it showing up as "Backups" when it used to indicate "Photos"? Are my photos safe on the external drive?
You have tested the library on the external drive, and so your photos are save there.
The local TimeMachine snapshot probably now contains a backup of the moved library. Try, if connecting your Time Machine drive will reduce the size of your local Time Machine snapshots.

Time machine back up and deleting photos from macbook pro

I have a macbook pro. I need to free some space on my hard drive. As I am a keen photographer I decided it was best to have at lest to back up in the event than one fails. I keep one off site at a friends. This way if the unthinkble happens.. fire, flood theft etc I do not lose all my images. To do this I require 2 hard drives. Having purchased the second I thought it would make sense to actually do a Time Machine back up as previous back ups were only of photos.
A few seaches of different forums appeared to say that you cannot delete photos from your Mac as this will be just Mirrored on your next Timemachine back up. This makes sense as it is copying the Mac so anything not on there will not be on the Time Machine back up.
SOLUTION : On your hard drive of the time machine back up create an addition folder or folders and using finder drag and drop from your macbook. This way it will not effect your Time Machine. You can replicate with the other hard drive. Having backed up away from the Time Machine will mean the photos do not get deleted by Time Machine after you have removed them from your Mac.
I hope this makes sense! It is the first time I have posted :-)
I would like to know if others have other solutions or use this method. I should say that the hard drive I use for the Time Machine if Mac formatted. It is a 2 TB WD My Book Studio. I purchased from the Apple store. It is not an apple product but is mac of the sleek aluminum and goes well with it. Having said that I keep it at a mates house!

There are several concepts that may help you create a defense-in-depth approach to securing your valuable data.
- Your data is much more valuable than external disk drives. Do not hesitate to purchase the size and number of external drives you need for great (not just good) backup practices.
- Always maintain at least two copies of any data. This means never place live (offloaded) files on a backup volume, even in a separate partition. If the drive fails the backup and the live files will go poof together.
- Do not rely on retrieving live files from a Time Machine backup. Time Machine is for restoring files that were deleted or altered by mistake or for a full restore. It is not for offloading live files.
- Place the offloaded live files on a separate disk drive. Then you will need to backup that live volume or if that offload volume fails then poof again.
- You already some of this base covered. Maintaing two copies (one backup) is good practice. Maintaining more than two copies (two or more backups) is a better practice. Maintaining multiple copies in multiple backup formats is a great practice. Time Machine is great for restoring accidentally deleted or altered data but it is a complex system that is more prone to failure than simpler schemes such as cloning. I recommend maintaining both Time Machine and cloned backups of the internal drive and cloned backups of offload drive.
Backing up the offload disk is where partitioning the backup drive can be handy. Create one partition for your Time Machine backup and another partition for your external drive backup. Backup your internal drive with Time Machine and backup the offloaded files using cloning software such as Carbon Copy Cloner or SuperDuper!
You could tell Time Machine to backup both your internal and external live files but then it gets tricky to do a full restore so I recommend using cloning software for backing up the external drive.
When you purchase another external drive, make it a sufficiently large one so you can divide it into multiple large partitions.
A good backup/offload map (two partitions per backup drive):
- Internal drive —> Time Machine backup partition A on the backup drives.
- External offload drive —> Clone backup partition B on the backup drives.
- Backup drives 1 and 2 (one onsite and one offsite), each with partitions A and B.
A great backup scheme includes three partitions on the large backup drives so you can backup the the internal drive with both Time Machine and CCC/SD:
- Internal drive —> Time Machine backup partition A on the backup drives.
- External offload drive —> Clone backup partition B on the backup drives.
- Internal drive —> Clone backup to partition C on the backup drives.
- Backup drives 1 and 2 (one onsite and one offsite), each with partitions A, B and C.
A great feature of having a clone of your internal drive is if the internal drive crashes you can boot off of the backup disk while you replace the internal drive. As mentioned above it also avoids Time Machine backup/restore problems. I have had Time Machine full restores fail so I do not trust them as my only backup method but I find them very handy for restoring individual files.
Create partitions sufficiently large enough for each backup source. Time Machine should be about 50% or more larger than the volume it is backing up to leave room for the older incremental backups. The cloned backup partitions need only be as large as the volumes they are backing up, or larger if you include incremental backups in your cloning scheme. This means you may need 2 or 3 TB backup drives. (4 TB drives are not yet reliable so avoid them.)
For more information on great backup schemes see:
Time Machine Basics: http://support.apple.com/kb/ht1427
Most commonly used backup methods:
https://discussions.apple.com/docs/DOC-3045
Methodology to protect your data. Backups vs. Archives. Long-term data protection:
https://discussions.apple.com/docs/DOC-6031
PlotinusVeritas gives some great suggestions for purchasing external hard drives in this thread:
https://discussions.apple.com/thread/5602141?tstart=0

Getting Time Machine back up to a Sparsebundle on external HDD (Drobo)

Hey,
I've been chasing this issue around for a while but can't seem to find the answer.
There are a lot of resources out there describing how to get your Mac to backup to a Sparsebundle on a NAS, and more resources telling you how to write protect the Info.plist file so that Mac OS doesn't resize the image to take up all of your NAS.
However I've got a Drobo connected directly to my Mac Mini. The Drobo pretends to have a 16TB drive so that you can add storage as and when you need it.
I am already using it to back up my MBP over the network to a Sparsebundle and until recently I was using the same scheme (a size limited sparsebundle) to back up the Mac Mini that the Drobo is connected to.
I achieved this by following the excellent directions on http://anitechtalk.wordpress.com/2010/07/19/time-machine-dns323/ (one of the only sites that mentions the new way that Apple handles Time Machine Sparsebundles)
However this has recently stopped working and no matter what I do I still cannot get my Mac to see the Sparsebundle as a TimeMachine aware 'drive'- instead it just backs up to the root of the '16TB' Drobo- and at some point it's going to get rather full.
Argh.
(And yes, I know that the other solution is to re-partition my Drobo to have a small partition at the start of the disk for Time Machine to use- but it's too late for that as I've already got 1.85TB of data on there and I doubt that I can re-partition that without losing all of the data.)
Can anyone help me get Time Machine to accept my Sparsebundle as a 'disk' that it can backup to?
Thanks in advance.

Thank you for the video link. I did it pretty much exactly the way the young man explained. The one thing I didn't do was click "customize" as he does and unclick the multiple language support and he also clicks "rosetta" to support older programs. I wonder if that's the issue? The guys at Macmall told me that I would need to update the o.s. before I restored. I did that originally but have since (as mentioned before) erased the main drive. I noticed that when he does his install, his external drive does not show up on the list in which you want to install the o.s. on... should I unplug my external? I'm just trying to look at ever detail. I know the recovery file is there. The one thing it (the external) did say before I started posting here was "in progress". I'm not sure what that means? I promise I'm not an idiot. I consider myself an above average user. I usually help other that have issues... but I've yet to restore from a Time Machine back-up and I'm looking forward to learning how to do it.... the right way. I appreciate all of the advice. I have some pretty important files on my external back-up. I am really hoping that this is possible. I'm beginning to think the external is where the issue lies. The "in progress" next to the file name concerns me. I know there's a lot of data on the drive because it's nearly half full. So there's stuff there....
Deep breath in...... reeee laaaaaaaxxxx

Time machine back up failing after itunes update

I am having a massive problem with my Time Machine back up.
My set up is as follows
late 2011 Macbook Pro 13" running latest version of Yosemite
An older Airport Extreme running version 6. something (latest version)
Macbook connected via WiFi on the 5Ghz
Connected via USB to the Airport Extreme is a Western Digital 2TB hard Drive.
My last successful back was 5.40pm on 1st February 2015. The only changes to the system that have been done since that time is an updated to the latest iTunes version.
This is what is happening.
Time machine shows the disc as connected and that there is 905GB of 2TB avaialble.
When the back up starts it finds the disk, prepares the back up and than starts.
It states the back up is about 29GB in size (so more than enough room on the hard drive).
The back up begins and after about 10 minutes (or somewhere around 4 or 5 GB) the back up fails and a pop up window in top right hand corner comes up saying that the back up has failed as there is not enough room on the Time Machine Backup (that is what I have called the drive).
I have run it a number of times and always the same thing.
I have run a disk utility check on the hard drive and run a repair disk and veriofy disk and both stated that there drive was fine with no problems.
I have powered down the entire network, shut the computer down and rebooted the whole thing but still the same problem.
I can't think of anything else I can do. Any suggestions from anyone greatly appreciated.

Problem solved. Can't remember what I did though!

When using Time Machine, if I delete items from my computer, will they still be backed up to access later on my external hard drive? In other words, when time machine backs up again, will it delete the files from the back up?

When using Time Machine, if I delete items from my computer, will they still be backed up to access later on my external hard drive?
In other words, when time machine backs up again, will it delete the files from the back up that I have deleted from my computer?

No, I do not believe so. Time Machine would keep all those now-deleted files in previous backups, and as time goes by those backups might be deleted if you needed room, but it would still keep one backup from each day in last month, as well as one from each week forever, as long as you don't start running out of room, then just the oldest would be deleted to make room if needed.
I use a backup drive about double the size of my drive to be backed up, so I would guess it will never get to the point where deleted files being replaced by new ones being backed fill up that drive to the point where backups actually have to get deleted.

Time machine backing up a second external hard drive

I currently have time machine backing up my imac to an external hard drive.I now want to back up a second external hard drive which contains all of my photographs to create some space on my imac.
Can this be done and if it can how is this done?
Thanks
Peter

First, be sure your TM drive is big enough for all your data (see item #1 in the Frequently Asked Questions *User Tip* at the top of this forum.)
Second, make sure the new external is set up with the GUID (preferred for Intel Macs) or +Apple Partition Map+ (preferred for PPC Macs) *Partition Map Scheme* and the +Mac OS Extended (Journaled)+ Format.
Then all you have to do is, go to TM Preferences > Options, select the drive in the +Do not back up+ box and click the minus sign at the bottom. That will change the +Estimated size of full backup+ under the box.
Once the new drive with the moved photos has been backed-up, and the old ones on your internal HD deleted, you can, if you want, delete all the backups of the old ones to gain some space on your TM drive. See item #12 of the FAQ Tip.

Time Machine Picture Library size is 2GB smaller in backup than computer disc.

Time Machine Picture Library size is 2GB smaller in backup than computer disc using Cmd I (Eye, not EL—don't we all love sans serif fonts as default) for both info.
Ah, this is readable at faster reading speeds.
Now ( oops the return key killed the font setting).
Now, we'll use run-on paragraphs. OK? ¶ On topic: I need more space to install a newer iOS on my iPhone. ¶ Someone at Apple Store Genius Bar advised deleting the album of pictures originally copied from my computer when I had vast memory space since it is already on the computer. Got 1GB About to say Available was still too low for the new iOS install. ¶ Another Apple Store Genius Bar advised making a good backup using TimeMachine on my computer and deleting all the pictures from my iPhone by the painful method of selecting each collection. ¶ So I thought I'd check how successful the backup was. Cmd I (doesn't look like El, yea!) on the Picture Library was 38 GB on my back up disc and 40 GB on my computer disc. ¶ Desktop folder is 87.1 MB (87,091,206 bytes) in both. How do I get the other 2 GB on the backup?

Time Machine Picture Library size is 2GB smaller in backup than computer disc using Cmd I (Eye, not EL—don't we all love sans serif fonts as default) for both info.
Ah, this is readable at faster reading speeds.
Now ( oops the return key killed the font setting).
Now, we'll use run-on paragraphs. OK? ¶ On topic: I need more space to install a newer iOS on my iPhone. ¶ Someone at Apple Store Genius Bar advised deleting the album of pictures originally copied from my computer when I had vast memory space since it is already on the computer. Got 1GB About to say Available was still too low for the new iOS install. ¶ Another Apple Store Genius Bar advised making a good backup using TimeMachine on my computer and deleting all the pictures from my iPhone by the painful method of selecting each collection. ¶ So I thought I'd check how successful the backup was. Cmd I (doesn't look like El, yea!) on the Picture Library was 38 GB on my back up disc and 40 GB on my computer disc. ¶ Desktop folder is 87.1 MB (87,091,206 bytes) in both. How do I get the other 2 GB on the backup?

Time Machine backup disk size - total capacity of disk or just files used?

Hi folks,
After upgrading to Leopard, I'm trying to set up my Time Machine. My main HD is 175 Gig and all the OS and other files take up 37 Gig of that. The drive I want to use for Time Machine (a spare internal hard drive) is a 75 Gig drive with 74 Gig of space available. Time machine says this drive is too small to use.
According to the Time Machine documentation, Time Machine takes the _total size of the files_ to be backed up and multiplies that by 1.2. So in my case, since the total files on my 175 Gig drive take up 37 Gig, then I would need only 42 Gig for my Time Machine back up. So, in theory, my 75 Gig spare drive should work just fine.
The problem is that Time Machine is taking the total size of the entire HD and using that to calculate the size of the back up drive, which would be 210 Gig. Does anyone know why this problem is occurring? It seems like Time Machine is not calculating the needed back up disk size properly and is incorrectly including the unused disk space on my main HD.

Not sure exactly, but your drive really is too small. Yes, 37 gb plus workspace would do for your initial Full Backup, but subsequent incrementals could fill it up pretty fast. That would depend, of course, on how you use your Mac -- how often you add or update files of what sizes.
If you change your habits and, say, download a multi-gb video, then work on editing it for a few hours, you could eat up the remaining space very, very quickly.
Just to be sure, how are you determining space used? Via right-click (or control-click) and Get Info on your HD icon?
Also, do you have any other HDs connected? If so, exclude it/them, as TM will include them by default.
Three possible workarounds:
First, get a bigger drive. HDs have gotten ridiculously cheap -- 500 gb (or even some 1 tb) for not much over $100.
Second, use CarbonCopyCloner, SuperDuper, or a similar product instead of TM. CCC is donationware, SuperDuper about $30, I think. Either can make a full bootable "clone", and CCC has an option to either archive previous versions of changed files or delete them. CCC can be set to run automatically hourly, daily, etc. (I suspect SD can, too, but I don't know it's details). An advantage is, of course, if your HD fails you can boot and run from the "clone" until you get it replaced, then reverse the process and clone the external to the internal.
Note that these will take considerably longer, as unlike TM, they don't use the OSX internals to figure out what's been added or changed, but must look at every file and folder. In my case, even smaller than yours, TM's hourly backup rarely runs over 30 seconds; CCC's at least 15 minutes (so I have it run automatically at 3 am). And, if you don't keep previous versions, of course, you lose the ability to recover something that you deleted or changed in error, or got corrupted before the last backup.
Third (and NOT recommended), continue with TM but limit it to your home folder. This means if you lose your HD, you can't restore your whole system from the last TM backup. You'd have to reload from your Leopard disk, the apply all OS updates, and reload any 3rd party settings, then restore from TM. As a friend of mine used to say, "un-good"!

Verifying a time machine back up package?

Hi
I need to do a clean install on my macbook. I have started a time machine back up of 200Gb or so, the backup was progressing over several hours but i can't confirm that it was completed. When i came back to the MacBook the message "this computer must be restarted due to a serious problem, etc, etc" was displayed.
Is there a way of verifying that the time machine back up is not corrupted? Time Machine is backing up now - a backup package of changes of 85GB size.
It seems to suggest that the first large backup was successful, or is it unwise to make that assumption?
the initial 200Gb backup took all night - approx 12 hrs. Can i verify the package?
many thanks for your advice
Nick

hi again, an update
the second, or perhaps more correctly, second half of the first back up completed with this log:
Starting standard backup+
+Backing up to: /Volumes/Time Machine/Backups.backupdb+
+No pre-backup thinning needed: 95.18 GB requested (including padding), 108.57 GB available+
+Waiting for index to be ready (100)+
+Waiting for index to be ready (100)+
+Waiting for index to be ready (100)+
+Waiting for index to be ready (100)+
+Waiting for index to be ready (100)+
+Copied 28.6 GB of 78.8 GB, 20748 of 790814 items+
+Copied 38.9 GB of 78.8 GB, 22274 of 790814 items+
+Copied 43.6 GB of 78.8 GB, 22276 of 790814 items+
+Copied 58.6 GB of 78.8 GB, 22276 of 790814 items+
+Copied 71.5 GB of 78.8 GB, 22276 of 790814 items+
+Copied 22631 files (73.2 GB) from volume MacBook.+
+Event store UUIDs don't match for volume: MacBook+
+Starting post-backup thinning+
+No post-back up thinning needed: no expired backups exist+
+Backup completed successfully.+
it seems that there were issues but no hanging or problems. the transfer rate appeared to accelerate and it finished with approx 6Gb remaining on the clock but the log appears to reflect this - the size appeared to be miscalculated.
I've forced a second backup through time machine, not waiting for the hourly schedule and it wants to do a deep traverse, perhaps due to the misreported size of the initial( incomplete) back up. Although, as i write this expecting a lengthy deep traversal it appears to have completed that in minutes. I have now selected a 3rd off-schedule backup and nothing happening much ie v quick check, so it would appear time machine is up to date.
I'm hoping all is normal. I'm now going to verify the disk.....done in only 2 or 3 minutesand log as follows:
+2010-11-02 19:36:41 +0000: Verify and Repair volume “Time Machine”+
+2010-11-02 19:36:41 +0000: Starting repair tool:+
+2010-11-02 19:36:42 +0000: Checking Journaled HFS Plus volume.+
+2010-11-02 19:36:42 +0000: Checking extents overflow file.+
+2010-11-02 19:36:43 +0000: Checking catalog file.+
+2010-11-02 19:37:09 +0000: Checking multi-linked files.+
+2010-11-02 19:37:12 +0000: Checking catalog hierarchy.+
+2010-11-02 19:38:03 +0000: Checking extended attributes file.+
+2010-11-02 19:38:33 +0000: Checking multi-linked directories.+
+2010-11-02 19:40:32 +0000: Checking volume bitmap.+
+2010-11-02 19:40:32 +0000: Checking volume information.+
+2010-11-02 19:40:32 +0000: The volume Time Machine appears to be OK.+
+2010-11-02 19:40:33 +0000: Volume repair complete.2010-11-02 19:40:33 +0000: Updating boot support partitions for the volume as required.2010-11-02 19:40:33 +0000: Repair tool completed:+
+2010-11-02 19:40:33 0000:
+2010-11-02 19:40:34 0000:
Having completed your advice i forced a back up (selecte 'back up now') andafter a quick check there was approx 50Mb of data to complete. So all would appear operating normally in time machine.
Now the acid question, can i trust this backup for a restore (as per the advice on top tips etc) as i'm about to run a clean install to my MacBook, the reason why i came here.
Many thanks for your help pondini, any more tips appreciated.
regards
Nick

My time machine back up is taking 98 days through a thunderbolt connection is there something wrong

My time machine back up is taking 98 days through a thunderbolt connection is there something wrong

sijam11 wrote:
When selecting my home folder on the iMac and using "Get Info" to see how much space has been used it shows around the 256g mark, but the space used up on my external hard drive is right up to 327g.
Is this normal after the first back up?
Hi sijam11,
That appears about right...
It is recommended that the Time Machine Drive be at least Twice the size of the Drive it is Backing Up...
You may find these Links of Interest...
TM 101 > http://support.apple.com/kb/HT1427
How Time Machine Works its Magic
Frequently Asked Questions
Cheers,

Time Machine back failure?

Hi all, I hope someone can help please.
My time machine back up has stopped working.
It tells me I do not have enough room on my 1TB external back up drive to back up to.
When I go into options and look at the estimated size of the back up it tells me that is is 2.59TB. But when I look at my Home drive it trying to back up it is only 116GB?
I'm not sure what to do as this does not make any sense to me.
Any ideas?
Cheers
Russ ;'o)

I have now fixed it.
Thanks for looking ;o)

Time Machine Back Up Discrepancy...

Hi All,
I have a June 2010 17" 2.66 i7 UMBP which has a 500GB internal HD. I recently purchased an external HD of the same capacity so I could keep a full back up of all my data.
The internal HD shows capacity of 499.76GB with 160.24GB free. After connecting the external HD to the UMBP & doing a back up via Time Machine, it shows capacity of 499.76GB with 166.99GB free. This means there is a difference of 6.75GB between my internal HD & the back up one which to me seems a large amount.
I can only assume that Time Machine has not backed up this missing 6.75GB of data & would like to know why this is so & what I can do to correct it. I have run Time Machine again a few times but the numbers still stay the same. Please can anyone else help me out here as at present, I just do not feel comfortable with they way things are & there is no way I can tell what data is missing on the back up HD - my luck is that it will probably be something(s) that might be important/critical in future!
Many Thanks,
Suave!

Suave! wrote:
I read somewhere that one should ideally use Firewire Drives for mac back ups instead of USB 2.0 as the latter can cause some problems - any truth to this?
Some. FireWire 400 is somewhat faster (and F/W 800 much faster) than USB for sustained copying, but other than your first (full) backup or if you have to do a large or full restore, the speed isn't much of an issue.
Also the FireWire chipset does some of the work that has to be done by your Mac's CPU for USB, so if your CPU is maxed-out while a backup is running, it may make some difference.
And many folks think FireWire is more reliable; I'm inclined to agree, but don't know if that's really true.
Also, is it possible to simultaneously run both Time Machine & SuperDuper on one external back up drive
I'd avoid putting all your backup "eggs" in the same basket. Use two different drives, if at all possible. Otherwise when (not if) that drive fails, you may lose both sets of backups. And if you use a portable external for the SD backups, you can take it to a secure off-site location, such as your safe deposit box, workplace, or relative's house, so you're also protected against fire, flood, theft, direct lighting strike on your power lines, etc.
If you do use the same drive for both, partition it, so each has it's own, exclusive space. See #5 or #6 in the FAQ if you need instructions.
And be sure the clone is excluded from TM backups, per #10 in the FAQ. Note you'll have to connect it to exclude it, and the exclusion won't appear while it's disconnected.
I think I read somewhere that the latest version of SD was "Compatible" with Time Machine?
That probably means SD can copy TM backups. CarbonCopyCloner (similar to SD) will copy them in "block copy" mode, but not "file copy" mode. But there's usually no reason to copy them, and other ways if you really want to.
Finally, my UMBP does have 4GB of RAM built in so I guess this "Sleep Image File" you mentioned would also then account for 4GB missing out of the 6.75GB amount on my Time Machine Back Up Drive but this then still leaves 2.75GB un accounted for - would things like system work files, most caches, logs etc (my trash is empty) really take up such a large amount of space?
Yes, easily. See the blue box in #11 of the FAQ for instructions on seeing the sizes of some of them (note that their sizes right now may not be the same as when you did the backups).

Time Machine Back Up Size

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