I have accidently deleted cards as an admin, is there a way to recover this?
Unfortunately I don't believe you can. We ran into this yesterday in our environment where some cards were deleted without the Admin realizing they were in use.
We spoke with Domo support and they have logged an enhancement request to have a delete warning that might show what pages a card is on before being deleted. I have logged an idea for this as well here: https://dojo.domo.com/t5/Ideas-Exchange/Delete-Warning/idi-p/27142#M5617
Perhaps you could log an idea to allow card recovery after deletion? I believe other users would find this very useful.
Best of luck