Transfer files from Backblaze B2 to OneDrive

Server to server, without downloading anything to your computer.

How it works

Connect both accounts once. ShiftMyData then talks to Backblaze B2 and OneDrive directly and streams the files between them in memory — nothing is written to our disks, and nothing travels down to your machine and back up again. The job runs on a worker, so closing the tab does not stop it.

Will every file be verified?

Backblaze B2 offers SHA-1 and OneDrive offers QuickXorHash — no checksum in common. Files are compared on size and modification time instead, which is the same basis every other tool uses for this pair; nobody can do better, because the two providers do not share a hash to compare.

Before you start

The largest single file OneDrive accepts is 250 GB. A bigger one is reported as failed and the rest of the transfer carries on.
Backblaze B2 treats Report.pdf and report.pdf as two files; OneDrive treats them as one. Where both exist in one folder, only one arrives, so rename one first.
OneDrive refuses the characters " * : < > ? / \ | in a name, a name that starts or ends with a space, and names Windows reserves such as CON or desktop.ini. Such names are written with look-alike Unicode characters instead of failing, and turn back into the originals if the files are later copied out through ShiftMyData.
Backblaze bills downloads beyond three times your average stored data in a month, so moving everything out at once can be billed by Backblaze.
A transfer copies each file's current content, name and modification time; sharing and version history stay behind on Backblaze B2. Business migration carries them where both sides support them.

Sources: www.backblaze.com · www.backblaze.com · support.microsoft.com

Worth knowing about Backblaze B2

B2 charges nothing for uploads, and downloads are free up to three times what you store in a month, which makes it a cheap destination. Moving a whole archive back out in one month can pass that allowance, so check before you start.

Worth knowing about OneDrive

OneDrive's only checksum is QuickXorHash, which Microsoft invented and nobody else implements. It verifies perfectly against another OneDrive and is useless against anything else.

Steps

On the Clouds screen, add Backblaze B2: paste an application key ID and key from the Backblaze console, ideally one limited to the bucket involved.
Add OneDrive the same way: sign in with Microsoft and allow access.
Pick the source bucket or prefix in the left pane and the destination folder in the right.
Choose a mode — copy, mirror, move, or two-way — and start the transfer.
Leave it. Progress is on the Jobs screen, and a webhook can tell you when it ends.

Questions

Do I have to download my files from Backblaze B2 first?

No. The transfer is streamed from Backblaze B2 to OneDrive on our servers, so nothing is written to your machine and your home upload speed is not the limit.

What happens if I close my laptop?

The job keeps running. It is queued on a worker rather than in your browser, and the progress is there when you come back.

How do I know every file arrived?

Is there a size limit?

None imposed by us. What you move is drawn from your prepaid allowance (30 GB free, then 500 GB for ₹100 or 2,500 GB for ₹500, each valid a year). OneDrive takes single files up to 250 GB, and its own storage quota applies.

Move a folder now