Is a cloud backup an acceptable backup for a home server?

Fuck the 3-2-1 rule, I cant afford that. I just have my server and that connects each night to another server at my parents and does an incremental backup via kopia.

Or at least, that is my plan, currently i hook up a 10TB HDD from time to time and do a ZFS send.. but the offsite backup is coming! For sure!

If it is not that much data though, take a look at Backblaze B2. Using that for a client that has a few 100 GBs and it costs about a euro a month currently. Incremental, encrypted, with kopia. But if it is multiple TB it can get real expensive real fast