Somebody even made it work with Linux-ARM. IDrive looks like it meets all the requirements except multiple sync folders, for $70 per year for 5 TB, with first year under $10. I didn’t even know I needed to add that to my requirements.

They don’t support Linux-ARM and they don’t support 2FA for web logins! Wow. SpiderOak is bearable at $150/year for 2TB, but if I grow beyond that, the next stop is $320 for 5TB. At $288/year for 2.5 TB, Tresorit is more than I want to pay. They are zero knowledge and multiple sync folders. SpiderOak and Tresorit come pretty close. Nobody meets all of these as of April 2021. Can I manage it when I’m 80? Can my wife get files out of it when I’m dead? I can back it up to a 3rd party so I don’t need a local backup. If I have 2 computers sharing an online folder, some files to sync with one and some with the other.

Uploads/downloads happen quick enough for my 2TB of data. Mac/Win/Linux-386/Linux-ARM - my Mac, wife’s Windows laptop, a Linux server, a future Windows laptop for me.Not like OneDrive where everything to sync lives inside a “OneDrive” folder. The vendor doesn’t store files unencrypted and doesn’t have the encryption key. And right now, my on-site backup is a beast of a server with triple-RAID for data and two-drive RAID for the OS. I’m skeptical I could keep it going when I reach age 80. I can sort of keep it going, but there is no way my wife would ever spend the effort, if I were temporarily disabled. I actually have all this right now, but it has too big a footprint. I need sync among my Win/Mac/Linux machines. … despite it not meeting my requirements.

Rclone idrive