No idea...I originally used a hand-written journal and there are 14 brews in that. I switched to tracking it on my laptop in 2009. Unfortunately, about 4 months ago my harddrive crashed and was deemed unrecoverable by my local computer repair shop. Since then I've been tracking on my iPad and I have 12 brews in there.
What I'm really upset about losing my harddrive was all of the recipe development I did...I'm mad just thinking about it...I should really just go back to the journal
No, what you need to do is consider how to back up your data. Two things that are certain: 1) EVERYTHIING is digital nowadays, and 2) Hard drives will eventually fail.
Digital records are far better than paper ones for many reasons, but you must have a solid backup plan. (my paper brewing records are long gone, eaten by bugs - literally)