I fit were up to me, every single piece of electronics that has memory capability would come with an A4 (Letter for the res of you) in big, bold, black letters that said:

"Data you don't have a copy of is data you don't want"

Personally I have at least 2 backups of anything important because backup systems have failed on me. And I strongly prefer backups you can restore manually and partially. I like Maemo backup app because it copies files.

Before staring OTA to 1.3, I have 2 backups called Pre13 using Maemo Backup, an image of rootfs+opt in an IMG, and image of root+optfs in a tarball AND a manual copy of everything on the device in a folder on the PC.

Funny thing is, it did break, and, out of all the copies I had, the imgs were not usable, one of the tarball versions (root+opt) were broken. Out of 4 backups, 2 have failed. If the SD card would have failed, I would have been boned. So yeah I'm paranoid. Bad stuff has happened to me in the past, irreplaceable data has been lost (corrupted pictures from years ago) and I'm touchy.

Oh, and, about those packages that prompt user and break mass installation? That's not an OS fault, it's a package fault. A package should install quietly and add a shortcut for manual (re)configuration, not prompt on install. Halting install for the user to accept EULA is silly. And no, "other" OSs don't do it, there's a -quiet switch for mass installs.