HI, here’s the problem:
one day I created some new cards as every single day, and then did them together with the reviws and relearning cards;
the next day I did my cards and I noticed all the new cards made the day before were completely gone - so after panicking a little, I restored an automatic backup and thankfully all cards were restored too;
thinking at that episode as a one-time problem, I continue to study my cards in the following days - after about a week (today) I check the deck and the cards were gone again - I tried the same procedure as before but this time all the automatic bakups lacked the cards (always the same 20-30 cards, I think)
I wasted more than a week of studying because all the reviews and relearning cards were at the same point (steps) as they were in the restored backup, obviously. Even if I restore the latest backup, it has the schedule data of three or more days ago (even if the auto-backup was made yesterday). Anki is also quitting randomly, but not completly: I can not see any windows or open/quit the app, I need to quit the program form Anctivity Monitor (if it is related someway). All that said, I need to say I’m a bit worried. Is there a way to prevent such problem or do I need to check every single day the number of cards hoping not to lose any card?