The app's Mac app can take up a lot of storage, in fact, it's not the app itself that uses space, but the database of images you've imported into Photos. So natural when you need to free up storage, there's a way to delete photos from the Photos app.
Say you've deleted some photos in Pictures, but now you need to get these photos back. And what if you, after deleting these pictures, added some new ones. So now you will restore the deleted pictures while keeping them just added. Can it be done?
Yes, but it requires some finesse. You will also need an external drive with enough storage to restore the entire image library.
If you have performed a Time Machine backup, it may help. Here's the main reason: Time Machine automatically deletes older still images as it adds new ones. Files deleted from your Mac will only last for as long as the oldest snapshot that contained them.
Time Machine retains weekly still images until a drive becomes too full to keep the oldest. If you have a very large drive or have not performed any updates of Time Machine in the months since you last accessed the drive, the old Photos Library mode is retained.
Provided that is the case, we can continue. [1
Time Machine allows you to collect yourself in Photos Library to retrieve certain images, but I suggest the best course of action with the highest chance of success is to retrieve the entire archived library. It requires enough storage space, of course, either on boot volume, Time Machine volume, or other external disk that can be connected to the Time Machine backup. You are best able to use an external disk.
How to restore an entire photo library.
Start Time Machine, located in the Applications folder. If Time Machine appears in the menu bar, select its icon and click Enter Time Machine.
Navigate to the Pictures folder in your home directory.
Navigate back in time to when you know that Photos Library was in the state you need
. Check-click the Images Library to select Restore "Photos Library," and then select a destination other than the current photo library lives.
Click Restore .
When the recovery is complete, hold down the Option key and start Photos.
When prompted, click Other Library and select the restored image library.
You can now select and export items from the recovered library, and then quit and restart photos using the option key to select your boot library and import these photos.
Another option after recovery is to use PowerPhotos ($ 30), which allows you to merge photo libraries. In this case, I recommend stripping all the pictures from the older library you do not want, so you can merge the slim library with the existing one. You do not lose metadata, original images and modifications and other data and
Delete all you do not let
Want to merge with the new library.
Start PowerPhotos and use the option to merge two libraries: your now old smaller size library and the current active photo library.
Another strategy for the future is to maintain separate photo library packages if you do not have enough storage space to keep everything in a single library and want to make sure you do not lose any pictures or videos you should delete.  This Mac 911 article is in response to a question Submitted by Macworld Reader Michael.
Ask Mac 911
We have collected a list of the questions we are asked most frequently along with answers and links to columns: Read our super FAQ to see if your question is covered. If not, we are always looking for new issues to solve! Send e-mail to email@example.com, including screen capture as needed, and whether you want your entire name used. Each question is not answered, we do not respond to e-mail, and we can not provide direct troubleshooting advice.