Automatically Saving a Backup Version
Each time you save a spreadsheet, you can save a copy without the changes you made
since last saving it. That way, if you change your mind about edits you made, you can
go back to (revert to) the backup version of the spreadsheet.
The best way to create backup versions is different, depending upon which version
of Mac OS X you’re running. Mac OS X v10.7 (Lion) and later automatically saves a
snapshot of your spreadsheet every time you save. You can access an archive of
all previous saved versions at any time. To learn about accessing and using past
document versions in Lion, see “Finding an Archived Version of a Spreadsheet” on
If you’re running Mac OS X v10.6.x (Snow Leopard) or earlier, you can set up Numbers
to automatically create a copy of the last saved version of your spreadsheet. You may
also find this useful if you’re running Lion, and you want to save a backup version of
your spreadsheet on another hard disk on your network.
To create an archive of previously saved versions of your spreadsheet on Lion or later
Choose File > “Save a Version,” or press Command-S.
To create a copy of the last saved version of your spreadsheet:
Choose Numbers > Preferences, click General, and then select “Back up previous version.”
The next time you save your spreadsheet, a backup version is created in the same
location, with “Backup of” preceding the filename. Only one version—the last saved
version—is backed up. Every time you save the spreadsheet, the old backup file is
replaced with the new backup file.
To revert to the last saved version after making unsaved changes, choose File > “Revert
to Saved.” The changes in your open spreadsheet are undone.