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Where are all Acronis Temp files saved during a backup?

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I'm assuming during a backup it creates or writes to a temporary location the list of files to transfer etc... For my it's more of a security risk, the two locations it's transferring between are secure locations so if Acronis is dumping the list of files in plain text somewhere on my drive that's a huge security risk.

Where are all Acronis 2014 temp files written and how can they be changed?

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They are stored in RAM, that is one reason why True Image is RAM intensive. There is are also some temporary folders that are created in your Windows\User\Temp folder. With the corporate editions (ABR11.5) there are lock files created on the image storage location along with the catalogue and cfg files. These are deleted on task finish, unless the PC has been powered off. In that case the files remain until the task is run again.

Thanks for this information Colin B. Unfortunately the fact that they are deleted on task completion is still not good enough as nothing is really deleted until you re-writ/zero over it therefore I really do need a way to control where these temp files are written. I am transferring between two encrypted containers, I can't have the name or shadow of the file be dumped in plain on the Temp directory, this is an information leak. Any idea what kind of data the Temp folder stores and how I can edit the temp location?

I believe not much, the lock files just lock the folder so it looses user read write, and the CFG, I'm not sure, they only amount to a few bytes in size so I don't think they contain much.

The temporary folders often have the SSID of the task being run, presumably so that if the machine goes into hibernation or is set to continue after a power down, the task can be restarted. The task when it is restarted is restarted from the beginning, it doesn't continue from where it left off.

If temporary files are stored in RAM, why does the TIH 2015 manual say that a minimum system requirement is "1.5 GB of free space on a hard disk"?

Not all of the temporary files are stored in RAM. You might notice that their is a 'lock' file produced in the same directory as your image, sometimes more than one if consolidation is taking place.

The 1.5GB of hard drive space is I believe mainly when installing the program, but it still needs a safety margin to produce its' temporary files when as I mentioned above consolidating a file or archive.