In no particular order:

1. Synology DS3615xs (12 bays, 25GbE fibre)
2. Synology RS1619xs+ w/expansion unit (16 bays, 25GbE fibre)
3. Synology DS1010+ w/expansion unit (10 bays)
4. Synology DS218+ (2 bays)
5. Synology DS220+ (2 bays)
6. Synology DS210j (2 bays)
7. TrueNAS system built into Jonsbo case, Intel Core i3-8100, 64GB RAM. Just completed. (5 drives, 10GbE)

Just the PC so far but there is no such thing as enough storage.

34TB so far but it’s been growing really slowly the past decade by just replacing any dead drive by a larger one.

The answer is ALWAYS 42!

Two, one in active use and the other has its main board (Raspi 3B) on loan for folks in my dept. I demanded, “As soon as we have 80-ish USD, we gonna replace that old clunker out for something recent using our department budget.” I could use a desktop PC as a case, tho (and use my Raspi-centered NAS as offsite backup back in my hometown).

• Synology DS1821+ with E10M20-T1 (main NAS)
• Synology DS1812+ (for backups)
• Asustor AS5304T (for Plex)
• Synology DS720+ (as a test bed)

4:

• Main NAS (DS918+) for Personal Data
• Media NAS (RS2418+ + RX1217) for Movies/Music/TV
• Remote Backup (DS414) NAS for my Main NAS
• Surveillance NAS (DS120) for IP-Cam recordings

u/100GHz, ZERO (answer to the question in title of your post)

Same OEM for 20+ years.

With that said, over the years, I’ve replaced the NAS(es) ca. every 4 years to their newer model (and with each newer NAS, then also new/larger drives as well)… so ca. 5th Generations of NAS Systems in that time frame todate

Note:

I always purchase at least 2 if not 4 of the same exact model and brand NAS (mainly for HA and/or redundancy --‘redundancy’ is NOT backup-- purposes… aka. one physical NAS dies, then you can literally take the drives out of the defective one, stick them into one of the other NAS, boot the device and have immediate access to the data if you are in a pinch --while the ‘temp’ replacement NAS drives will be out of the chasis and of course not available–)

Best Regards

I have one PC connected to two DAS enclosures, each having 5 drives installed for a total of 10 drives.