Biggest advantage / difference between Lightroom and Photoshop

But your hint concerning the DAS unsettles me a little bit. Sure, my computer hast got a DAS, but I dont do safety-copies of my mac and the same for my sisters mac. We just work on the NAS, which surely has got safety-copies. And what is, if I sell the computer? Than I have to remind those annoying catalog-files from Lightroom classic? Is this what Adobe thinks is an appropriate usage!?? Sounds bit strange 2 me…
Or is this fact just the exclusion for LightroomClassic and I should use Lightroom?

By @Markus Kleine

When you sell the computer, if it’s a Mac, then the standard procedure is to use Apple Migration Assistant to easily transfer all of your account information and data to the new Mac. This is very easy and works well, and it means when you start the new Mac, it works as your old Mac did, with the data in the same place. A Lightroom Classic catalog folder on internal storage would naturally be included, and just go along for the ride with everything else. No extra work. If you store the catalog folder on DAS, then the only change is that you now connect the DAS to the new Mac, and everything is there.

The reason Apple provides Migration Assistant is the issue of storage on computer is not unique to Lightroom Classic. For many apps, a lot of your data must be on the computer and it’s difficult to make some of them work with external storage. For example, if the Apple Photos or Apple Music content is too large for Mac internal storage, there is a way to store their content on external storage, but it causes complications. But also, any of your system and account settings are on that Mac, so there needs to be an easy way to transfer them to a newer Mac, and Migration Assistant is that way.

If you wanted to sell the Mac first, then you could make an Apple Time Machine backup of it, sell the Mac, buy the new Mac, and then have Migration Assistant set up the new Mac from the Time Machine backup. If the Lightroom Classic catalog was on internal storage and therefore included in the backup, it will be there in the backup and migrated to the new Mac.

Or is this fact just the exclusion for LightroomClassic and I should use Lightroom?

By @Markus Kleine

It depends on what you do with those shoots:

Lightroom Classic will catalog images, store edits in the catalog, and build previews, you can store the original photos on internal storage, external DAS, or external NAS storage, and store the catalog on internal storage or external DAS.

Lightroom was originally only cloud-based, but recently added local edit capability, so it now has two modes now, Local and Cloud. Any images imported in Cloud mode are uploaded with edits also stored in the cloud, and those cloud originals are completely unconnected from your local file system, so in Cloud mode the NAS cannot be involved. So if you were to use Lightroom, you would use Local mode, which is a local file browser similar to Adobe Bridge + Adobe Camera Raw: There is no catalog, edits are stored in sidecar XMP files, and the only organization is the local folder hierarchy. In theory you could use Local mode to browse the NAS and edit images there. But Lightroom currently lacks many of the features in Lightroom Classic and Bridge/Camera Raw, such as advanced metadata filtering, advanced settings copy/paste, and advanced batch exporting. And some Lightroom features work only for cloud-synced images, not local. So you might prefer Lightroom Classic (or Bridge + Camera Raw if you really don’t need many of the cataloging features).

Right now, my thoughts are, that I only want to check, if the photos me or my sister has shooten in the studio are sharp. So I leave them on my camera sd-card and copy them after shooting onto my NAS.

By @Markus Kleine

For that workflow, I think you might simply use the image review built into Cascable. It can be set to automatic, so that the review window appears immediately after each shot.