If you want to backup an on-prem server to Azure, the easiest way to do it is with Microsoft Azure Backup Server (aka MABS). To do this your server needs free space of about 8% (Microsoft says 5%-10%) of the space you are backing up. So if you want to backup 1TB, you should have AT LEAST 80GB free.
Here is the catch. Is you are also backing up the System State of a Domain Controller, your server needs and ADDITIONAL 35GB. Sooo, in our example with a server that has 1TB of data, if it was also a DC, your server requires AT LEAST 115GB (80GB + 35GB) of free space to operate MABS. That is the amount of SCRATCH space MABS needs.
That default location of the MABS scratch folder is c:\Program Files\Microsoft Azure Recovery Services Agent\Scratch
. So you may have disk space limitations on your C:\ and need to move MABS scratch folder after the initial installation.
MABS cache / scratch folder has to be located on a normal NTFS or ReFS disk so none of these features are supported:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Azure Backup\Config\ScratchLocation
to point to the new scratch folderHKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Azure Backup\Config\CloudBackupProvider\ScratchLocation
to point to the new scratch folderNow you should run a test backup to make sure all is well.
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