Can I delete the iPhotos migrated library after it has been converted to a Photos library?

Also bear in mind:

iCloud is not a backup

The problem with iCloud for photos (and files if you use iCloud drive) is it makes all the libraries across all the devices the same. While it does protect you from a drive failure - it doesn't protect you from accidental deletion. If you delete photos on your phone, they are deleted on your mac, and from iCloud - same if you delete on your mac - they'll be deleted on your phone. There have been rare cases of system failure also causing deletions (or just user error). There are also numerous examples of library corruption making it very difficult to access photos.

Every few days we get someone here saying "I deleted photos - how can I get them back". If it was more than 30 days ago (or they’ve been manually removed from recently deleted), and there is no other backup, the answer is "you can't"

Hi

Yes you can delete it if you are sure everything you need is in your photos library (some older items might not migrate if they are no longer compatible). However, you won't get the space back that you expect, since the original photo files are not duplicated but shared with the photos library - so you'll only recover space taken by preview files and the database. Maybe 10% of the space shown as being used.

1. Yes, if you're not going to be using it in iPhoto again. Note that the media files are hardlinked, so deleting it will free up far less space than it seems.

2. No. The Photos library won't be changed.

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