Manage versions of a Preview document
Preview automatically saves changes for you as you work, so you don’t have to explicitly save your changes. You might want to explicitly save a document if you want to, for example, save a copy of the document in a different location.
Preview periodically saves “snapshots” of your document, called versions, so that you can revisit the document as it appeared in the past and revert to a previous version. When you’re actively editing a document, Preview saves a version at least every hour, and more often if you’re making significant changes. Preview also saves a version when you open a document, save or duplicate a document, lock or rename a document, or revert to a previous version.
Explicitly save a Preview document
If you make several edits to a document and you want to be sure you have a version with all of them, choose File > Save.
If you created a new document by choosing File > New from Clipboard, it’s saved automatically as you edit. When you’re ready to name the document and place it in a particular location, choose File > Save.
To save the document using a different filename, location, or format, hold down the Option key and choose File > Save As.
If you have iCloud set up and iCloud Drive turned on, you can save your documents in the Preview folder in iCloud Drive by clicking the Where pop-up menu, choosing “Preview — iCloud,” then clicking Save. For more information about working with files in iCloud, see Store your desktop and documents in iCloud Drive.
Tip: You can also hold the pointer over the document title and click the arrow to save the document or change its location.
Create a copy of a document
To create a copy of a document to edit in Preview, choose File > Duplicate. When you’re ready to save the document, choose File > Save, enter a name, select a file format, then choose where you want to save it.
To create a copy of a document so you can archive it or convert it to another format, choose File > Export.
Revert to the last saved or opened version
Choose File > Revert To > [option].
Examine, recover, duplicate, or delete previous versions
Choose File > Revert To > Browse All Versions.
Click a gray tick mark along the timeline on the right to display various versions of your document.
Do one of the following:
To restore your document to the state of a particular version, display that version, then click Restore.
To create a new untitled document that duplicates a particular version, display the version, press the Option key, then click Restore a Copy.
To leave your document in its current state, click Done.
For information about editing iCloud documents, see If there are conflicts between versions of an iCloud Drive document.