I havent had a problem for the past couple years I used it but that doesnt mean problems dont occur so do yourself a favor and backup locally too you can encrypt that backup with veracrypt or any other encryption software you like. If I had to nitpick, the android app isnt the best visually speaking but it gets the job done. As for alternatives, an e2e encrypted cloud provider that you trust is probably what you would like that or a self hosted solution but I’m not familiar enough to speak for that