When you go to update your Mac software via Apple Update, each line item contains the size of the file. Is this the size of the download or the actual size it will take up once the update is installed?
For example, say I have 1,000 MB of free space, and there's an update which says "200 MB" in the Size column. Generally, once I install this update, will I now have 800 MB of space left on my system?
Or is there a chance that this is not an incremental upgrade and it will replace existing files that are already taking up space on the system?
For example, say I have 1,000 MB of free space again, the update is 200 MB again, and the current version I have installed is taking up 100 MB of space. However, this time let's say it's not an incremental upgrade, and it will replace the 100 MB I already have, which ends up leaving me with 900 MB of free space after the upgrade.
Which of these scenarios generally happen when using Software Update? (Am I missing another scenario?)