I've used B2 for some internal backup handling (several 100s of GB but millions of files) and have largely found it inexpensive and performant. A few considera

I've used B2 for some internal backup handling (several 100s of GB but millions of files) and have largely found it inexpensive and performant. A few considerations: Their web UI can not handle large amounts of files (support said after a few million the file browser will not work). Sometimes when making a large number of deletions at once the API may serve 500 errors and the web UI give Java Servlet errors (this only happened a few times and resolved itself in a hour or two). As another user noted the per file/fragment upload speed isn't fantastic but I could max out my gigabit fiber with many concurrent downloads/uploads. The API has no concept of folders, only file path strings (which is mildly annoying to work with). Lastly I think all the data is currently housed in one geographic area but they are working on a DC in Phoenix. Overall a pretty smooth experience but I was mostly using it for cold data.