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So I have 3 nas units total. 2x DS1621+ and a Terramaster f5-221. The terramaster (5 bay, 5x 4tb) and DS1621+ (6 bay, 6x 4tb) have been in use for about a year. I just got a 3rd nas, a DS1621+ and 4x 4tb drives. Now I would like to use the 3rd nas as a backup for the other 2 units. I realize that I dont have enough space on the 3rd to hold the filled contents of the other 2 yet, but this what I have at the moment.
The terramaster and synology in use have about 9tb total between them used. The terramaster is raid 5 btrfs, and the synology is shr1, if that matters.... My original plan was to replace the TM with the 2nd Synology, and use the TM as the backup nas... But if I use the 2nd synology as backup in shr, I could buy bigger drives in smaller numbers as my data grows? (like add a couple 10tb or larger when I can afford it)
Where if I use the TM as the backup only device I have to replace all 5 drives at a time (right?)
Turning to the more experienced users here for some guidance...Opinions?
The terramaster and synology in use have about 9tb total between them used. The terramaster is raid 5 btrfs, and the synology is shr1, if that matters.... My original plan was to replace the TM with the 2nd Synology, and use the TM as the backup nas... But if I use the 2nd synology as backup in shr, I could buy bigger drives in smaller numbers as my data grows? (like add a couple 10tb or larger when I can afford it)
Where if I use the TM as the backup only device I have to replace all 5 drives at a time (right?)
Turning to the more experienced users here for some guidance...Opinions?