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As title I'd like to know if it's possible to install SP1 without backup files - that is without the uninstall option.

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The patch itself does not say that you can (see screenshot), however, sometimes they are undocumented at patch level. You can try running it with the /nobackup switch.

enter image description here

Here is a list of Microsoft command line switches, but not all work for all programs or patches.

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I have actually confirmed that in this case, the /nobackup switch does not work. – KCotreau Jul 1 '11 at 0:47
Yes, this is not working. This is REALLY bad because guess what: files in Updates folder from the source media (updated with SP1) are copied in C:\MSOCache; plus a tons of files are copied in C:\Windows\Installer. Indeed i'm going to waste about 1Gb of space because i don't need to remove SP1. – user34295 Jul 1 '11 at 0:53
Can you manually delete the files you don't need? – Moab Jul 1 '11 at 1:09

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