M1911 Loc: DFW Metromess

If you resize and export to the original folder, you gain nothing unless you trash the raw file. Remember LR is non-destructive. Why Tiff? Jpeg would be more space saving. I think you could go through folder by folder and sort each folder by your rating then batch export to 2048 pixels on the long side. That will keep your cropping and other adjustments. Export them to a new folder on the desktop uysing the same name as the original but add tifs or jpgs to the name.

Then all you need to do is drag each folder into the original folder as a subfolder. After that you can delete the raw files through Lr if you want.

Naturally, someone will come along and say I'm wrong. I'm used to being wrong, I'm married.

burkphoto Loc: High Point, NC

The answers (you may not know) you are looking for may or may not involve your original questions...

First of all, TIFF (.tif) files come in about 49 flavors. The one you want (the one that actually does something positive for you) is a 16-Bits-per-color-channel TIFF in ProPhoto RGB color space. Its only real purposes in existence are to be used as an intermediate between Lightroom Classic and Photoshop, and to serve as a transport mechanism for printing at a very high end boutique giclée lab or print shop. Otherwise, just use raw files and export high quality JPEGs in sRGB.

The pixel dimensions exported from Lightroom Classic will be the actual cropped pixels, unless you specify resizing. If you resize to a percentage or to a specified long dimension, the aspect ratio will not change. This ain't Microslop software!

Yes, you can bulk export to any folder you like. Just select the range of images you wish to export in the "slide sorter" thingy at the bottom of the screen before you bring up the Export dialog. If you select 60 images, the Export dialog will queue them up, apply the same settings to all of them, and send them to the same destination folder. I do this all the time... sometimes with hundreds of finished files.

Lightroom Classic's Export dialog is very full featured. It is made for production. I create slide shows for presentation on 4K TVs and projectors. All of my images are cropped as 1:1, 3:2, 4:3, 5:4, 7:5, or 16:9 aspect ratio. But I export them as 3840x2160 pixels (4K UHD standard). What can't be image simply becomes "fewer pixels." Nothing gets distorted. That is so I can import all images into Final Cut Pro and do panning and zooming with the Ken Burns effect.

CHG_CANON Loc: the Windy City

Honestly: spend the time necessary to better understand the fundamental technical details of your images and your software.

1, Your LR catalog maintains the original unedited RAW files (as well as all source formats) in the original unedited format and size.

2, All your LR edits are maintained internal to the LRCAT file. Although the LRCAT file grows over time, still it's relatively small as compared to all your source (original) image files.

3, You do not need to output your edited images from the LRCAT, unless you have some specific purpose. And then, only then, do you need to consider what format & size that Export image needs to take.

4, Your idea to export as TIFF is just fundamentally and 100% W R O N G. In a LR Classic environment, using TIFFs is (again) 100% unnecessary, except solely for the purposes of passing images to a 3rd-party software that does not accept a DNG and / or PSD format. And, when that TIFF comes back to the LRCAT from the 3rd-party software, consider if there are now multiple input / output TIFFs such that 1 (or more) can be purged from disk.

If you have the desire to store an 'archive' version of your edited versions, just export as a full-resolution JPEG.

Key points:

A, Give up on this TIFF idea. TIFFs are nothing to a RAW shooter using LR Classic.

B, Find out where your real disk 'problem' resides. Reading your entire post, I'm not seeing / understanding your exact issue. What is the total storage of all your images? What consumes most of this storage, the TIFFs or maybe just unculled (unedited / unneeded) RAW images? Is adding external storage, in the form a portable HD, a better solution than all the processing work you've questioned regarding 'how' in this post?

C, You cannot reduce the disk storage needs with TIFF. C - A - N - N - O - T.

D, I'm not purposefully being rude, but I can't be there to shake you by your shoulder to emphasize you're looking at the wrong solutions (TIFF) for an as-yet unclear problem.

BebuLamar

If you resize you lose most of the details there. If you save them as full size JPEG you lose less details yet smaller file size.

But any way, in my opinion just keep them as raw. Storage is cheap. Put them on external drive and put the drive away.

Imagemine Loc: St. Louis USA

The best way to save without worrying about resizing. If you get an external hard drive, with 1-2 terabytes (tb) you will achieve your goal. Just create a folder label it and import your images to that folder, I use SanDisk extreme portable SSD, then you can delete images from your computer, hope that helps, & have a wonderful weekend. p.s. that will give plenty of room