[acdha]

You might be fine simply with Dropbox since they added an extended history plan which seems perfect for this:

https://www.dropbox.com/en/help/113

The main thing I'd worry about is locking down your default browsing profile & otherwise making it less likely to be compromised in the first place. I would imagine for most people on HN, the greatest inconvenience would be dealing with the mess if malware got access to your employer/customer's servers, data, etc. That's harder (e.g. rigidly separate accounts or computers, reducing the amount of access you operate with normally, etc.) but avoiding that mess is worth it.