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The line chart can only be shown if there was a scan of the same root folder performed at an earlier point in time.

Furthermore, for a reasonable comparison the scans must have the same exclude filters defined. With TreeSize v8 and later, you can skip this check and include all history data, regardles of the filters.

Please note the the history is saved in each user's Application Data folder.

When using Excel as export format, TreeSize will create a spreadsheet with the current timestamp and save the data into this sheet.

If the same file is selected for another export, TreeSize will create another sheet and append it to the file, so you won't lose the data from the previous export.

In general, TreeSize can scan any systems that have a drive letter assigned in Windows. This typically applies to local drives, network shares, etc.

Most mobile devices will announce themselves as MTP (media transfer protocol) devices, which allows access via Windows Explorer without having an actual drive letter assigned. 

TreeSize supports the MTP protocol since v6.3 and should thus be able to analyse all data available with this protocol.

Please note that most operation systems do not grant access to all of the files on the device via MTP. Especially system files and internal data can not be scanned this way. User data (like pictures and videos) usually are accessible.

TreeSize is capable of scanning Distributed File System environments. It will follow the links to the target directories so you won't have to map single shares. It can be necessary to activate the option "Tools > Options > Scan > General > Follow external mount points and symbolic links".

Yes, this is possible by using the "Group scans" feature available on the "Scans" ribbon bar. Using this feature it is possible to group scans under a virtual root folder. This virtual root folder shows a summary of all scans that are part of this group. This way you can merge different scans together e.g. for printing or exporting. You can add or remove scanned paths individually from the virtual root folder using the context menu.