@Ravi @Robin : While you've got 'em, make bookmarks for each.
I have a really old Mac, and a couple of years ago UW started making a whole bunch of changes that made working on my computer more difficult—including, for about 2 weeks, I couldn't see my saved searches. I thought I was pretty much done on UW, because frankly looking at everything on the app is just too difficult.
But—the searches did come back one day, and the minute I saw them again, I bookmarked them, so that if they ever were missing again (as long as they were still in UW's system somewhere), I could just use the bookmarks to navigate.
Sub-optimal, I know... and I haven't needed it since and even forgot about that weird time... but backups are nice to have for just-in-case.