My main one the RS1219+ (8 x 6TB N300 Toshiba drives) is the store for all my audio visual media and other files, CMS host, Active Backup for Business (AB4B) store and Surveillance Station (SS) failover server, it also hosts VM's from my HP Z620 2x Xeon E2660 Esxi host via 10Gbe Unifi US-16-XG switch everything is replicated to two volumes on my DS1513+ & DX513 (mix of older 3TB - 8TB drives) in my detached garage, this was my first Synology NAS.
The DS1019+ (5 x WD Purple 6TB) is main SS recording server, it has a small 512Gb section as a second volume with twin Cache nvme m2 attached (used to run a VM but not any more), I have 16 camera licenses not including free ones.
A DS1813+ (8 x 4TB drives) is a SS recording server, this and the DS1019+ currently record 18 cameras 24/7 for 75 days in and outside my home, volumes at about 75% capacity so room for a couple of more weeks if I wanted.
A DS118 (500GB drive) acts as a SS host only.
The DS1019+ (5 x WD Purple 6TB) is main SS recording server, it has a small 512Gb section as a second volume with twin Cache nvme m2 attached (used to run a VM but not any more), I have 16 camera licenses not including free ones.
A DS1813+ (8 x 4TB drives) is a SS recording server, this and the DS1019+ currently record 18 cameras 24/7 for 75 days in and outside my home, volumes at about 75% capacity so room for a couple of more weeks if I wanted.
A DS118 (500GB drive) acts as a SS host only.