How do I export jpgs as tifs with the original resolution ?

Hi,
I am very new to Lightroom 5 (I only installed it today (on Windows 8.1) :-)) but I have read Victoria Bampton's Quick Start Guide and have read a number of forum posts over the last few weeks to get an idea about how the program generally works.
I am embarking on a project to scan and archive my family's photos and videos, and I will be using Lightroom to manage the collection.  To start the project, I have just imported over 10,000 digital photos taken by a variety of cameras (36 of them, according to Lightroom !)  over the last 12 years or so into a new Lightroom catalogue.   These are all currently JPEG files, but I want to keep TIFF files in the collection because my research has led me to the conclusion that TIFF is a better long-term archival format.
I started by doing an Export of a small number of photos to save the .jpg files as .tif files, but when reviewing the results, I noticed that the image's resolution was changed during the export.  For example, one original jpg is only 96ppi but the exported tif is 240ppi.  Another jpg is 180ppi and the tif is 240ppi.  At least, that's what the metadata seems to be telling me (via the Details tab of the Properties dialog in Windows), so I assume it's true...
I understand that the 240ppi that I am seeing in the .tif file metadata was specified in the Image Sizing section of the Export dialog, so that's not the issue.  
I would prefer it if the .tif file has the exact same resolution (ppi) as the original .jpg, but I am unable to work out how to do it.   It would be great if the resolution setting in the Export dialog was controlled by the Resize to Fit checkbox, like the other settings in the section, but it doesn't appear to be (it's enabled even if the Resize to Fit checkbox is unticked).
I then thought about using the Library Filters to filter by the Horizontal Resolution metadata, so that I could select all the photos with the same resolution and export just those with the Resolution setting in the Export dialog set to the right number, and then repeat that process for each different group of original photos with a different resolution.  Unfortunately, I have not been able to work out how to filter by the horizontal resolution metadata field - it doesn't seem to be available in the dropdown list of fields shown when I click on the up-down arrow next to the "Date" or "Camera" (etc.) columns in the Library Filter pane.
Finally, here's my question (or three):  
Is there a way to export .jpgs to .tif files while keeping the original resolution ?  
Alternatively, is there a way to select groups of photos by their horizontal or vertical resolution (so just those photos could be exported in a group with the right resolution specified) ?
Or is there any other way to do what I want (convert jpg to tif with the same resolution and keeping all the metadata) ?
Thanks for reading all the way through to the end.
John.

These are all currently JPEG files, but I want to keep TIFF files in the collection because my research has led me to the conclusion that TIFF is a better long-term archival format.
I'm not sure why you say this. In terms of long-term archival format, I think the two are equal, I am not aware of other reasons to do this, and thus in my opinion, the task of globally turning all your JPGs into TIFFs seems unnecessary. You don't gain anything by doing this. But you sure will spend a lot of time and take up a lot of disk space doing this.
I would prefer it if the .tif file has the exact same resolution (ppi) as the original .jpg, but I am unable to work out how to do it.
Again, I think you have embarked upon an unnecessary task. The ppi in the file is essentially meaningless. A photo that has (for example) 3000x2000 pixels saved at 240 ppi is the exact same photo as the same photo 3000x2000 saved at 180ppi, not a single pixel has changed. You are placing a meaning and importance to this ppi number that just doesn't exist.
To answer your questions at the bottom, I would advise you to not do the things you are talking about, it seems to me that you have greatly misunderstood things.

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