Memory required for 10,000 photos.

Sorry! Soon as I posted I realised that I needed to give more info. I have iCloud storage so not an issue. I want to be able to store on harddrive as well as Cloud. My current laptop (refurbished Toshiba) has led to the loss of 7,000 family photos - tech guy said that they’re irretrievable & that computer is wrecked. The photos left are thumbnails, I think, or Index files. Anyway, they were also being stored on the Cloud by the photo app Picasa 3 but are also irretrievable there. I recently (& too late) discovered that Picasa is defunct & I think that photos were meant to be migrated to Google but mine are not there. Fortunately I have all photos on data sticks. So yes, I will upload to Cloud. All my devices are apple (iPhone, tv, ipad etc) & have been for years & now I want to finally integrate everything & buy a Mac. Photos are from iphones and digital cameras. Hope I’ve given enough info. K.

Ok. I’m not a techie so can’t tell you the resolution of the photos but I would say minimal bc most can’t be enlarged without significant decline in resolution. Photos were taken on various iphones over the years & on digital cameras of average (i.e., inexpensive) quality. Simply family snaps so not professional. Does that help? Can I check anything on laptop to answer your question better? What would you consider a reasonable amount of storage? K.