On Azure itself, I find I can make blobs with names of length 1000, but not 1100 (so I guess 1024). Using dev storage I can do 200, but not 300 (so I guess something related to MAX_PATH). Is there an official limit?
The maximum size of a block blob is 200 GB. But by utilizing striping, the maximum size of an individual backup can be up to 12 TB.
Azure Storage supports three types of blobs: Block blobs store text and binary data. Block blobs are made up of blocks of data that can be managed individually. Block blobs can store up to about 190.7 TiB.
A block blob can include up to 50,000 blocks. Each block in a block blob can be a different size, up to the maximum size permitted for the service version in use. To create or modify a block blob, write a set of blocks via the Put Block operation and then commit the blocks to a blob with the Put Block List operation.
From http://msdn.microsoft.com/en-us/library/dd135715.aspx:
A blob name can contain any combination of characters, but reserved URL characters must be properly escaped. A blob name must be at least one character long and cannot be more than 1,024 characters long.
The Azure Storage emulator supports blob names up to 256 characters long.
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