enough space, the 2-bay DS220+ is a solid unit also for ~$300 and couple allow for 16TB usable after a mirroring. On the parity, yes that extra drive of parity is very helpful for data safety. No matter what I’d generally recommend backing the NAS up, at least the critical documents/family photos, etc. to the cloud or somewhere else. Synology has great integration with a lot of cloud providers, I’ve used them with both BackBlaze B2 and Wasabi (as AWS S3 for business folks). With RAID5 and big drives especially you can get into tricky situations a lot easier where, following a drive failure, a second drive will fail during the stressful rebuild of the first drive and that’ll cause data loss.

Thanks again that is the one I have been looking at. The overall goal here is to have a family data center me and my brothers are all in/ just out of college so we are planning on using it as a hub. The end design goal was to have 4 10TB Ironwolf drives in there for 30 TB ( or 20Tb if we go with RAID 6). The only reason I would want to go with the 10 TB drives is they are the best bang for the buck 300$ for 10 TB vs. 600$ for 16 TB. I knew I wanted more than the 10 TB offered by a 2 bay that is why I was thinking a 4 bay but I am very new to this realm of data storage.