XMind can store all saved revision of a file as a history list. Every revision can be reverted or deleted easily.
Open revision view from file menu
Handle revisions in the view
Select a revision and click the button on view toolbar, you can preview, revert, or delete it.
Navigate revisions
Left/right arrow key can help you here to switch among revisions.
Note: All these revisions are saved in this .xmind file. And the file size will grow while revision quantity increases. If there are too many revisions, the file size may be too big.
If you do not like this revisions, please check the option, Automatically save new revision when saving this workbook, in the revision view. Disabling this will not save the revision.