Precautionary file backup when upgrading karmic to lucid?

[kismul]

After putting it off for too long, I'm goig for the update from 9.10 to 10.o4 lts. Before I do it, are there any files it would be wise to copy? All personally generated files are on the removable hard-drive. Apart from software, only my email message files are in the directories on the hard drive filesystem - as far as I know. I'll back them up, along with my firefox bookmarks. Anything else I should be doing?

Many thanks

Jim

PS I've searched for a topic covering this on the forum but can't find one. If anyone knows somewhere, a link would be much appreciated.

[kismul]

Well, since I've not had any response, I'll be brave and assume that there will be no problems.

Wish me luck......