You can rsync from your Linux pc to your phone via SSH over port 8022 (you’ll need Termux), and schedule when the script runs with a cron job. Here’s some documentation:

https://www.baeldung.com/linux/android-rsync

+1 for Pine Note!

What a clever idea! Is the dirty water drained from the bottom of the bowl or is it pumped out?

Soft Scrub with Bleach works well. Clean the sink with dish soap the best you can. Once it is clean, apply Soft Scrub with Bleach with a sponge and allow it to whiten for a couple of minutes before rinsing it off. I do this about once a month or whenever it starts to look scummy again.