I love all of the well thought out answers. This backup is in addition to my backup to GCP. I was using Bvckup 2 to backup to a couple external HDDs to have a second backup in case anything ever went wrong with duplicacy/gcp/encryption codes. These ran out of space and I didn’t want to split it to yet a third drive.
At first I was just going to use duplicacy with some external hard drives and split the backup. Hoping the deduplication would hold me over for a while. Then I decided to resurrect an old NAS I have and RAID 0 a couple of drives together so I don’t have to split into multiple backup sets. Then I decided that since the NAS was too slow (half the speed of GCP or less comparing to the old initial GCP logs… hard to tell), so I bought an old 12 bay server, second raid card, some 8088 external connectors, etc all cheap on ebay and I’m going to setup a DAS.
If I add it directly, I agree that anything additional might be unnecessary overhead. I think I’m actually going to connect it to a virtual backup server on the same machine though and since there’s a lot of overhead on samba/ windows file shares, I will probably use mino (usually, if you ask for 1 file exists, it downloads the entire directory listing each time you check a file (this happens transparently, but it happens)).
I also like the suggestion that using mino will provide bitrot detection. Another reason to use it. Duplicacy check is dreadfully slow in my experience as well… understandably so, but still. I wouldn’t have even considered this without your replies so THANK YOU!!!
My last consideration is that I have most of my servers on and offsite, backup to my main server storage, which then gets backed up 2 more times. If I can skip my main storage, create a second encrypted bucket for mino, and replicate that to GCP directly from mino as the site claims, it might save me some storage space/ allow me to keep more redundant snapshots.
“In addition, you may configure Minio server to continuously mirror data between Minio and any Amazon S3 compatible server.”
Again, thank you all for your thoughtful responses.