Businesses need to pay for hundreds (or thousands) of backups with one credit card, and they don't want to enter that credit card into the payment interface hundreds or thousands of times. Is Backblaze Business Backup a more affordable alternative to B2īackblaze for Business is EXACTLY the same product as "Backblaze Personal Backup" (same price exactly) with one addition: businesses have one particular problem that it solves. In this case Backblaze will upload the entire file again from scratch, all 5 GBytes. This is the worst case scenario, because you have SHIFTED all the bytes and none of the chunks will match anymore. This is the second best scenario because Backblaze uploads at most 1 or 2 chunks from the center of the file.ģ) You PRE-PEND 1 byte to a 5 GByte file. Backblaze will re-upload the 1 chunk that changed (or at most 2 chunks if the change crossed over a 10 MByte boundary and affects two chunks), and not upload any other chunks. This is the best scenario, because the last chunk is less than 10 MBytes (it is the only chunk with a variable size).Ģ) You change a few bytes in the center of a 5 GByte file, but you do not change the overall number of bytes in the file. In this scenario, Backblaze will only upload the very last "chunk".
If it matches something previously uploaded, then it is not uploaded (no bandwidth is used) and it just records where to get that particular chunk at a later time when you prepare a restore.ġ) You append a few bytes to the very end of a 5 GByte file. The very best situation is if it is a duplicate of the same chunk in the same file, but it will also work if that 10 MBytes matches a single file uploaded earlier, or a chunk out of any previously uploaded file (it doesn't have to be from the same file). Then it goes to upload each 10 MByte chunk, but at the last second before transmitting it can "de-duplicate" that chunk. It makes a complete copy of the large file broken down into 10 MByte "chunks" and this copy is written to disk in the "Temporary Data Drive" (by default that is your system boot drive, but you can change it in Settings.). Small changes on big files: complete reupload or only delta?įor any file smaller than 100 MBytes, Backblaze Personal Backup will re-upload the entire file.įor files larger than 100 MBytes, it is classified as a "large file" and goes through a completely different code path. Disclaimer: I work at Backblaze and wrote a lot of the code that uploads changes to large files.
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