Apps in Google Suite (Docs, Discs and Images) keep track of all edits, changes, and versions of a file so you can return to an earlier version if you need. Here's how to do it.
First open a file that you have saved on Google Docs, Sheets, or Slides. We use Google Docs, but the process is the same on the two other services.
Open the "File" menu, click on the "Version History" submenu, and then click on the "View Version History" command. Alternatively, you can press Ctrl + Alt + Shift + H.
Note! If you do not have editing permission for a file, you will not be able to view the Version History section of a file. This will not be a problem if you created the file yourself.
Versions of a file are grouped with related changes on the right side of the window. Depending on how careful you are, they may have real names, or they can only be sorted by the time you created them. Each version is a collection of edits that are grouped and merged based on the age of the file or the size of each version. This is done to save storage on Google servers.
If you click on a specific version, your file will temporarily return to that state in the main window on the left. It will also show the changes made with who did them.
For an even more granular view, click the chevron next to a version and then click on a certain event to view the version
Once you've decided For a version you want to switch back to, click the "Restore this version" button at the top of the window.
A popup will warn you that your document will return to another version. Click "Reset".
If you are not satisfied with the restored version of the file and want to return to an earlier version, do not worry; everything is not lost. Google does not automatically delete anything. Instead, it makes a copy of the version you chose and make it the current one. Return to Version History by pressing Ctrl + Alt + Shift + H. From here, repeat the previous steps to restore your file back to the previous, which should be located near the top of the list.