I'd be more concerned to lose data that is stored in the cloud than on my private network.

The adage "there is no cloud, it's just someone else's computer" is still true.

If you are afraid to lose the data on your clients and servers in your private network, improve your backup strategy and make sure to have one backup off premise (in a safe deposit box if needs be).

It doesn't hurt to improve overall security on your private network, either. 😉

I store my documents in a 3 disk raid 5, which is backed up to a brand new NAS red, which is backed up to a 8TB external via Borg, and finally to my 1 TB OneDrive via rclone.

So at this point, no...

3-2-1-1-0 and you have 99.9999% covered. I replicate all backups between four physical locations, doesn't get more overkill than this. For personal use I even have a backpack with external HDD in it, that syncs the most important data every day.

Thats why i burn M-Disks, even if i put them in a System with Malware, i can be sure it can't mess with the Data, in die Cloud i use Object Storage with Object Locks...

You can just setup a minio cluster (ideally separated in Hardware and Firewall) and put stuff there with Object Lock if you want to be sure.

I just removed write access from anything I don't want to be overwritten together with rclones --immutable flag. (Its push and pull, because my Laptop is not on all the time so the Laptop pushes when its on and the Server pulles when he is on)

My technique is don't do too much so when it breaks you can get it back. Or maybe make a script on GitHub that'll redownload all shit

I have my important data stored on a RAID1 for some redundancy, but otherwise it's just snapshotted to an external drive plugged into my server. It's not ideal and I have two plans I really need to get around to implementing.

I have a detatched garage so I am going to set up another machine hidden in the roof space of the garage where I can have "offsite" backups. It won't get found if my house is being burgled (you need a ladder) and it's far enough away that it hopefully survives if my house burns down. My garage already has ethernet cable.

Another option would be storing some stuff at a friends place if you have friends that self host. I've also been meaning on setting a Wireshark tunnel to a friends server and we can borrow a little bit of each others space.

Borg incremental and dump in gdrive encrypted