Make sure you have at least two copies in seperate physical locations. If you are going to be carring this around you can't trust it, even if it has RAID. Acctually my guess would be RAID boxes would be more prone to failure when being moved due the increased complexity and if the drive would die due to impact or abuse chances are both would be damaged, but I don't have the evidence to prove it.
My suggestion is:
- Get two cheap 2.5'' portable USB drives.
- Label them A and B. Copy all of your data to drive A.
- Copy everything from drive A to drive B, and place drive B somewhere safe (safe, safety deposit, someone elses house, just make sure they aren't in the same place).
- Once you make made a significant number of changes (end of season, after event, etc.), copy all of the change from drive A to drive B, and then put A in the safe place and use B to make changes.
- Keep repeating step 4, swaping drives each time to even the wear.
EDIT: You could give up on the second drive, and use online backup/storage as you duplicate copy. Either way you MUST have a second copy or you WILL loose data.