Protecting data against bit rot

I have realized that I need to protect all of my photographs against bit rot (file corruption occurring at random due to errors in hard drives or network transfer). I recently discovered par2 which seems like a great program to create redundancy files and give the ability to detect and repair file corruptions. I don't think journaling file systems are the right solution here, since I want the protection to follow along with the files into my backup and when migrating onto new laptops. So, what I think I need is a script that can be run as a cronjob, maybe once an hour. It would look through all of the files that needs protection and update the redundancy files if files are added or changed (file has edit timestamp newer than redundancy arhive), and it would repair files if any file has been corrupted (file has changed but edit timestamp hasn't been updated). Is there any script or program that would do this? Or are there programs that solve the problem in another way? Or should I just write such a script myself (a would prefer not to, I want something robust and tested by a lot of users)?