to commonly asked questions.

Do I need to increase my iCloud storage when first syncing my devices?

When I'm turning on iCloud photo syncing It is saying I have to buy 9.99 in iCloud storage a month to turn photo and iCloud on—is that what I do to make the transfer? I don't think I have that many pictures.

It is very possible that once all of your devices (iMac, laptop, iPhone) start talking to each other through the cloud, iCloud adds up all the pictures and realizes you have more pictures than space. It then recommends you increase your storage space to combine them all. However, I’ve often seen that iCloud is mistaken about the total number of pictures because people sometimes have the same library in two places. In other words, duplicates. The good news is that while iCloud doesn’t know it yet, it will discover the duplicates during syncing and just keep one of them. Most adults in the 35 and over crowd usually have around 100 gigs or more of photos. Younger people have less because they haven’t lived as long. That being said, most people I work with are in the 200 gig $2.99 a month category (including myself). I doubt you actually have over 200 gigs of pictures. What this all means is that you can turn on the recommended storage upgrade (temporarily) while iCloud sorts everything out, then about a week later, downgrade to the 200 gig plan. That’s most likely where you’ll land. If you can’t downgrade in a week, that means you have A LOT of pictures. Most likely not the case.
This image is a theme.plist hack