Taivi

Affinity Designer keeps crashing my work is getting lost updates are done regularly for affinity but when i did my last few macOS updates i lost files and they became corrupted. This is my work and livelihood and i am now having to take extra time to save each file triple places. Even after all this i just lost a current design as affinity suddenly shut down in the middle of me working and then immediately restarted but my working file was not restored and as i hadn't finished working on it i hadn't yet saved. i am very unhappy can't afford more tech rn and i need the app to be working. seems like bugs with new apple updates are incompatible with already saved files onto of other issues like sudden shut downs. Please advise...

Can someone tell me how to reduce the file size for export into jpeg in Affinity Designer and not lose the quality please?