I am very new to online backups but have done some research on different styles of backup. I have the problem of limited upload speed and want to see what type of backups are available. For example if I have a folder that has 1GB worth of data in it and I back it up do Azure will it be compressed before transmission to Azure and if I only change a portion of one large file in that folder will it reupload the entire file? If I understand correctly I think I would be best suited with a block level backup using incremetal forever method. I have about 1.5 TB that will need to be uploaded eventually and only have 5mbps upload.
I have used carbonite in the past but I have the problem of not finishing the first backup before it is time to start the next weeks backup. Please advise on the methods/style that Azure uses for data transmission and compression.