Wasabi 與 Storj 是在看到「Will Cloudflare R2 Win Customers from Amazon S3?」這篇文章時翻到了三個 Cloud Storage Provider，文章本身我倒是沒什麼吸收...。

第一個是 Backblaze 的 B2，這個產品平常的曝光度就還算夠。

另外是 Wasabi 的部份，其中一個賣點是免費的頻寬，但其實限制意外的多。首先是各地區的價錢：

我找了一下到底是什麼地區，目前只有看到「Wasabi Technologies Inc Status」這邊有編號 (US-East-1、US-East-2、US-Central-1、US-West-1、EU-Central-1、AP-Northeast-1)，但也沒找到地區... US 的都在美國沒問題，AP-Northeast-1 應該是日本，但 EU-Central-1 是哪裡就找不到了。

另外是 pay-as-you-go 的方案最小是 1TB，如果是歐美區的話是 US$5.99：

For customers using the Wasabi pay-as-you-go pricing model, Wasabi has a minimum monthly charge associated with 1 TB of active storage. If you store less than 1 TB of active storage in your account, you will still be charged for 1 TB of storage based on the pricing associated with the storage region you are using.

然後也有 90 天的最短計價時間：

Wasabi has a minimum storage duration policy that means if stored objects are deleted before they have been stored with Wasabi for a certain number of days (90 days when using the Wasabi pay-go pricing model), a Timed Deleted Storage charge equal to the storage charge for the remaining days will apply.

另外 Wasabi's free egress policy 這邊也可以看出來他們的設計就是拿來當 storage 用，然後前面需要擋 CDN 之類的服務。

最後一個是 Storj 的 DCS，US$4/TB/month 的空間費用，與 US$7/TB 的流量費用感覺還算便宜？他的做法是把檔案拆成 80 份，然後取 29 份就可以算回來：

How many Nodes are files stored on?

80. We split each file into 80 different encrypted pieces, and each piece is stored on a different Node.

When you retrieve an object, only 29 of its 80 pieces are needed to reconstitute that object. With no central point of failure, your data is always quickly available, all over the world.

這部份是則是透過 Reed-Solomon error correction 實做：

Automate file repair and know that Reed-Solomon erasure coding enables the highest levels of durability for all files uploaded to Storj DCS.

好一陣子沒看到 Reed-Solomon 了，沒想到在這邊看到... 先不管技術的部份，看起來 Storj DCS 的價錢可以玩看看。