With PubKey and Fail2Ban its probably ok but wouldnt chance it personally. Can you use a different port too?

321 rule - anything super critical also gets off-sited to the cloud.

All of the above. + Archival

Law suit evidence, payslip/tax stuff and car service history are my main 3

Couple of tools ive wanted

1. Proper car service history tracking thing that allows you to create a vehicle, then log services/repairs/consumables with dates, prices, locations, maybe even upload the invoices etc. Bonus points if it can generate a PDF service report for when its time to sell the car. Could also integrate chosen service intervals etc so you can view what milages things are next due. I did see hammond but it feels more operational cost logging focused (eg fuel expenses)

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2. A computer bench marking system where you can create a configuration, add a benchmark type, then record the benchmark results. This could then make pretty graphs etc to compare different configurations/benchmarks