I accidentally deleted 450 cards. Time has passed as I have sought support. My test is this Friday. It would be wonderful to restore these cards so that I may review them tomorrow. Support instructed me to go to this link: https://docs.ankiweb.net/#/files?id=backups
However, the link instructs to go to “File Menu” and “Open Back up”. I do not have any of these. I am on the free version b/c I am studying for a certification and only need Anki for a few months.
You can find the “Open Backup…” button on the Profiles window, which you can get to by clicking "File" -> "Switch Profile"
Another way to get to your backup folder is by clicking “Tools” → “Addons” → then in the Addon window select “View Files” From there you need to “step out” of the current folder into Anki2, select your user and then backups.
The files are sorted by date. Open the one you want to restore. You can try around a bit until you find the backup where the notes are still here.
Menu, File- Switch Profile (as mentioned in the second response above ^^^). The switch profile dialog also opens up when you start Anki desktop and you have more than one profile. So I suspect you only have one profile just now.