[Pelican]

I don't know if there is any way to recover those lost days. Others may.

My practice is to save frequently (it's only a few seconds), and to back up the game as well, on a regular basis, and for sure after major trades or signings, on a daily basis. Again, it's only a few seconds to create a backup. I have restored seasons from backup after a crash or some issue, without any loss of data.

I usually set saves to "dynamic" rather than the default setting. I actually don't know what that means, but it seems to yield frequent saves, if I happen to forget.

I realize my advice is the classic "closing the barn door after the horse escaped". Prevention rather than a remedy. I hope you can recover the data somehow.