Carls,
Yes, totally true. Basically if you're able to create a CD that has an integrated SP, you shouldn't need to call MS for support..
MS also sells CDs that have the SP already integrated.. Anyway, if you need the MS support (wtf ?-) then you can just say you have XP with SP1 installed and not tell them that you integrated it yourself..
The SP release notes tell you how to integrate it and several sites tell you how to extract the boot.cat from the original CD and make the selfcompiled CD bootable.
Oh well, this is veering a bit too far from Amiganess .. perhaps we ought to continue this via pmail or email, if you have more to say.. :-)
Oh and re: the original subject, I use a DLT drive and MS Backup to backup WinXP (the windows dir and all the dirs where I have my own creations and installed sw), it's well under the 10GB that my DLTIII handles).. It lets you save the registry, so when your HD crashes, you just install a basic XP and then restore everything from tape and have a working system again, timewarped back to the point of your last backup!