Hard Drive and Time Machine backup Different Sizes

I had a lot of difficulty getting Time Machine to work with my new Time Capsule. It seems to work now but I noticed that on the initial backup the size of the backup data on Time Capsule was roughly 148 GB and my hard drive size is roughly 159 GB. If I were to do a backup would I discover that some of my data is missing? Or is it normal? I have not excluded anything from the backup. Thanks.

I sorted out the problem on my end, and perhaps the same thing will you help Gadifer. In my Aperture preferences, Library Location was incorrect - for some reason there are two. In my case it should be ~/Pictures/Aperture Library.aplibrary, whereas it had become ~/Pictures/My Pictures/Aperture Library.aplibrary (I don't recall changing in manually, and wasn't aware that there were two). When I check them in Finder, I see that the former is several GB, and therefore my actual library, while the latter is only 538 KB.

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