Q: iCloud

HI

I've had a email advising  iCloud photo storage has been disabled and I have 30 days to download the stuff stored.

I Haven't requested this - although my son, who's autistic and obsessed with making videos on my phone - may have done it error.

The email advises that I can reverse the request by going into Manage Storage and selecting 'undo' but this is not available. the only option is 'disable and delete'

is this a scam/spam email? If not, how do I ensure my icloud photos are not deleted, as I wish to carry on using it

thanks

T