Fim is interesting, but I think most people (including myself here) don't worry about this because we rely on snapshots of backups. If a file was updated incorrectly then you just go back to the last known snapshot that worked.

Of course this is only as good as the interval you use for your snapshots. Fim seems like it would be a lot of extra work to do for every file/folder, but I could potentially see using Fim though for important files (e.g. tax records?, password vault?)