Because Numbers continually saves your work, you can browse earlier versions of a spreadsheet, save copies of previous versions, and restore a spreadsheet to an earlier version.
In the spreadsheet manager, tap Edit.
When the spreadsheets begin to jiggle, tap one, then tap Versions.
Thumbnails for previous versions of the spreadsheet appear.
Tap a previous version to select it.
Tap Preview.
Numbers displays the version. You can search for text in the preview, and you can copy text and objects. However, you can’t edit in the preview.
Do one of the following:
Save a copy of the version shown in the preview: Tap Save a Copy.
Numbers opens the copy as a new spreadsheet for you to edit. (The original version is available in the spreadsheet manager, where the copied version also appears.)
Close the preview and return to the current version: Tap Close.
A restored version replaces the current version. To keep the current version and an earlier one, make a copy of the earlier version, as described in the previous task.
In the spreadsheet manager, tap Edit.
When the spreadsheets begin to jiggle, tap one, then tap Versions.
Thumbnails for previous versions of the spreadsheet appear.
Tap a previous version to select it, then do one of the following:
Restore the version: Tap Restore. (To leave the most current version unchanged, tap Done instead of Restore.)
The restored version appears the next time you open the spreadsheet.
View the version and restore it: Tap Preview, then tap Restore. (To close the preview without restoring the selected version, tap Close instead of Restore, then tap Done.)
Numbers opens the restored version for you to edit.
Note: Collaborators with editing privileges can copy and restore only the versions created after you shared the spreadsheet. Collaborators with view only privileges have no access to earlier versions.
If you add or change a spreadsheet password, the password applies only to versions created after the password was added or changed. To prevent others from restoring unprotected versions or versions with older passwords, stop sharing the spreadsheet, add a password to it, then share the spreadsheet again.