I found TrueNas scale to be what fits my needs but I tried unraid (trial) and open media vault first. Also not this is not my first rodeo as I've done "from scratch" Ubuntu, and bsd.
I just built a server from older parts off eBay. An i7 2600, Asus p8z77, a Silverstone c382 nas case, 32gb of 1333, a pny P600 video card and a 9200+8i hba card. Then I used TrueNas on an SSD and another SSD for docker containers and cache.
4k Plex streaming no issues, system is fast and the only issue I had was the old Asus boards don't use pwm fan control.
Open Media vault just confused the heck out of me, I ran it for a few months and donated money to the team for their effort but it was too restricting for my needs. It was definitely a capable nas os but it didn't feel like it fit my style which is more hands on.
TrueNas has snapshots and replication. I run 4 12tb disks for my live data, striped raid 1's. Then I have two more 12tb's in a raid 1 for my replication read only. It's not enough space if I filled my live drives but I havent needed more yet for the backup. And I can always expand my backup set.
I also have a qnap tr004 das with some random drives in a hardware raid 5. That's my third copy I do every so often.
The funny part is I didn't want to pay for a Synology but ended up spending more on parts. However it's incredibly powerful for what it does so I'm using that as my "happy little mistake". It's going to last a long time and run as many services that I could possibly want as a home user.
Yep! Scanned documents and backups of photos, personal stuff and the families stuff. I host a few game servers too I guess for friends. Running great and more than enough power for everything I do, and I have as much redundancy as I can afford.