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Difference in backup size to original drive content (Trial version)

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Hello

I am currently running True Image 2018 in the trial period. I am backing up the content of our organization's NAS drive to a portable HD. I set up the first backup ran it and I have a couple of questions: 

1. When the initial backup was (nearly) complete, I received a series of messages similar to "NAS address\filename was not backed up as it is blocked by another application". I would then get a similar message with the only difference being a forward slash instead of a backslash. The file or folder name shown in this message does not exist in that form on the NAS, nor are any of the computers on the network named that way. I can't figure out where it is picking up this path. 

2. When the backup said complete, I compared the size of the backup with the size of the original content. Original: 571 gigabytes; Backup is 524 gigabytes. Without going through and checking folder by folder, I don't know why the difference. Is there compression going on? I set it to back up the entire contents of the drive.

I may be missing something really obvious, but any guidance would be appreciated. Thanks!

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Rob, welcome to these User Forums.

Please download the MVP Log Viewer tool from the Community Tools link in my signature and use this to view the full log file for your backup task - this should give more detailed information about any messages that you saw.

Depending on the type of data involved in the backup source, then compression could account for the difference in size that you have seen (571GB versus 524GB) - ATI can normally achieve around 20% compression unless the files involved are already in a highly compressed file format (such as some image, video formats etc).

Steve, thank you very much for your response. I did download the MVP log view as you recommended. With further research it looks like some of the folders that were blocked were other computers on the network and I'm assuming that I am blocked from adding them to the backup by admin rights. 

Thank you as well for your feedback on the compression question. I appreciate your quick response.   

Rob