I agree, a merged dropbox with borg backup / time machine style deduped history going back as far as you want to pay for, with a resolution control. One example

I agree, a merged dropbox with borg backup / time machine style deduped history going back as far as you want to pay for, with a resolution control. One example: Save every version for the past few days, every hour for the past month, every day for the past 3 months, every week until 6 months, every month for the past X years, etc. Will also need something to control software that goes really wild with new versions, or some specialized rule sets for software repos, video editing, etc. Ransomware & compliance escrow would also work great for this, you could have contracts that wont allow deletion after X months no matter what the other organization says to help prevent social engineering or account take over attacks.