I’ve pared down my former backup plan by removing duplicacy. Nothing wrong with it, and deduplication is nice, but it was all overkill. Also not using CCC as much, and ChronSync just copies a folder for DT access.
I’m using Backblaze for my offsite backup.
I use Arq 7 to backup to my Dell server running TrueNAS in a QEMU VM, and to my Synology DS918+ I use sftp to back up to both, and had to install OpenSSH on the Synology, as theirs sucked.
I also back up monthly to a couple of WD Passport drives, alternating each month.
Finally, I back up just my iMac Pro (not my striped 2x2T of SSD where my research lives) to what may or may not be a bootable SSD every week or so.
My wife is super happy now, as I installed Backblaze and Arq on her new M1, so she doesn’t have to think about doing backups. (I do make sure they’re happening.) Arq runs at 4am each day, and Backblaze is continuous, of course.
My research data, Obsidian notes, and some folders that were DT databases (now just folders) get copied by ResilioSync to my NAS and selectively to my M1 MBP.
I don’t do any creation on my MBP, so don’t back it up. I’ll probably install Arq on it soon and back up 1/day to my Dell.
I have an expendable Windows box, and will probably install Arq on it at some point.