GarageSale 7 keeps your database in a folder called
com.iwascoding.garagesale7 in your User Library(*) under
Macintosh HD/Users/yourUserName/Library/Containers
If you have the folder com.iwascoding.garagesale7 opened in the Finder you can restore
it using Time Machine.
Another way is to transfer that folder to your Mac manually.
(*)Please note: The User Library is hidden by default. To access it click the Finder’s “Go” menu and press the option key to make the User Library show up in the menu. Selecting it will open it in the Finder.
Regards, Kristian