Unwanted copying of data from external to internal memory

DavidP225 wrote:

I understand that Documents is what would be described as a system folder in PC circles - and not to be messed with.

It's the opposite. The Documents folder is where you should store all of your documents.

I did manage to Incapacitate a system folder once

That can't happen on a Mac. All the system folders have very tight protection on them.

Photoshop and Lightroom are in a folder within the Applications folder along with the working catalogue and seem to be working fine.

What do you mean by "the working catalogue"? Those are 3rd party apps, do I don't know how they work. But generally speaking, only apps should be inside the Applications folder. The applications folder can have slightly more restrictive permissions on it. It's meant to be accessed by all users on a computer. But if one user puts files there, then other users may or may not be able to access them, which may or may not be a good thing, depending. It's better to put documents in the Documents folder.

The only caveat for this is if you're using iCloud Drive with Desktop and Documents. That might not be appropriate for data packages. I'm thinking of things like a Music library or the Photos database. That's why those are not in the Documents folder, on purpose. I don't know about Photoshop and Lightroom. If they use any kind of self-contained database, then they shouldn't be in either Applications or any kind of sync-controlled location like Documents (or Desktop or iCloud Drive, or 3rd party cloud location).

What is bothering me is the apparent 'Data Grab' by Documents. If it turned out to be almost impossible to divert the output of Pages, for example, that might be inconvenient but not puzzling. It's the copying of a whole file tree from another drive that concerns me - I've always understood that folders were passive repositories, but perhaps this one isn't so passive.

I'm reasonably confident that I haven't done anything to trigger this copying, but no guarantees!

I'm less confident. 😄 The only way that Documents will be automatically populated by anything is if you are using some kind of cloud sync service like iCloud or some 3rd party service. Even then, you would have to explicitly set it up to run that way.

Did you ever enable storing documents on iCloud?

That can cause unintended consequences.

What you're doing is reasonable-- there's nothing wrong with keeping stuff on an external drive. You can even boot off an external drive, but that can be rather slower. I'm a bit confused about why you're asking this in the Photos Community. Is there something special happening with Photos? You don't say if you are using iCloud Photos or iCloud Drive. iCloud Drive must be on the internal boot drive.

How is your external drive formatted? Certainly for Photos, and maybe for other apps, an external drive must be formatted in either the modern APFS format or in the older Mac OS Extended (Journaled) format. The drive must be connected directly to the Mac by cable, not networked, clouded, NASed, etc. Additionally, the drive can not have had Time Machine on it since it was formatted. See this:

Move your Photos library to save space on your Mac - Apple Support

If this drive is in a an incompatible format, stop running Photos with it immediately!  A Photos Library can sit on an incompatible drive, but running it may corrupt the database.

"Documents" and "Desktop" are special folders on a Mac. Apps often put their data there by default, and of course the contents of the Desktop folder shows up on, well, the desktop. These two special folders must be located in your User folder, unless you especially choose in System Settings to locate them in iCloud Drive.

Normally the apps like Photos, Lightroom, and Photoshop are kept in the Applications folder on the internal drive. I can't think of a good reason to put them someplace else. Adobe can be weird about where it stores data-- some is kept with the app, but data defaults to Adobe albums in the Documents folder, I think, though I don't see any there-- I think I moved the default catalog and stuff. A Photos Library can be kept in pretty much any non-special folder, and it's fine on a properly formatted external drive.

It's OK to have a folder named myDocuments. You can also have a folder named Documents someplace other than the User's folder or iCloud Drive, and it will be treated like other generic folders.

I'm not sure how much of this you already know or if it even applies to your problem, but it's a start…

How exactly did you "move" into your first Mac?

What steps did you follow? Did you use any app or tool to move over? Was this from a Windows PC? IF so, did you use Migration Assistant?

If you use the Migration Assistant with a Windows PC, then by definition it will copy everything in the selected user folder to a new user on the Mac. This includes any files and folders in that user folder, so if your myDocuments folder was there during migration it would have been copied over.

Beyond that there is no way for it to just magically copy a folder onto the Mac unless you manually do so. So what exactly did you do after connecting the external drive to the Mac?

You are assuming many things incorrectly. The Mac does not just appropriate folders on external devices based on name. Something else had to happen.

You will need to really explain what you did step by step, so we can understand what happened, and avoid any assumptions since that can lead to incorrect choices being made.

I would just verify that you are in fact seeing the files on the internal documents folder and just accessing the myDocuments folder on the external drive by mistake.

For instance if you open a file form the external drive the app it opens in, will when saving it default to that location directly.

Also, since Macs don't actually use drive letters like Windows, your external drive will appear as just another location in Finder, with the only indication its external being a small eject icon next to its name. Are you sure you aren't just seeing files on the external drive, because as mentioned macOS will not simply copy files to itself without user intervention.

Perhaps posting a screen shot and redacting any personal or sensitive info, might lets understand what you are seeing.

etresoft wrote:

DavidP225 wrote:

Photoshop and Lightroom are in a folder within the Applications folder along with the working catalogue and seem to be working fine.

What do you mean by "the working catalogue"? Those are 3rd party apps, do I don't know how they work. But generally speaking, only apps should be inside the Applications folder.

Lightroom has a catalog file that it uses to help keep track of your full-size photos. I believe that it also likes to keep some cache and/or thumbnail files.

For best performance, these files should live on a fast drive – such as an Apple Silicon Mac's internal SSD. Full-size photo files, which aren't accessed nearly as frequently, can go even on a mechanical hard drive.

However, I have never seen a recommendation that you should put your catalog and cache files into the Mac's Applications folder! Some place like the user-level Documents or Pictures folder seems more appropriate, and Adobe's online Help indicates that the default location is a Lightroom subfolder within the Pictures folder.

Adobe Help Center – Optimize Lightroom Performance

Adobe Help Center – Preference file and other file locations | Lightroom Classic

DavidP225 wrote: …What is bothering me is the apparent 'Data Grab' by Documents. If it turned out to be almost impossible to divert the output of Pages, for example, that might be inconvenient but not puzzling. It's the copying of a whole file tree from another drive that concerns me - I've always understood that folders were passive repositories, but perhaps this one isn't so passive.

I'm reasonably confident that I haven't done anything to trigger this copying, but no guarantees!

That would bother any of us! But I've never heard of it happening-- normal files jumping from folder to folder. A person could make macros or shortcuts or scripts to do that, but those aren't on the Mac skulking around waiting for an opportunity to confuse us-- you'd have to intentionally look for one and intimate it. (I'm just thinking of ways it could go-- not likely at all.)

Do you have a cat? I always blame my cat…

I'd say, see if it happens again. But it's not normal.

Can you tell us a bit more about how you placed these files into myDocuments on the external drive?

For example, did you copy them directly onto that drive while it was attached to your previous computer? Did you copy them to a temporary intermediate location like another external drive?

Did you by any chance copy them to the internal drive of the new computer and then drag them from there to myDocuments?

Phil0124 wrote: I would just verify that you are in fact seeing the files on the internal documents folder and just accessing the myDocuments folder on the external drive by mistake.

yes— good suggestion! There are lots of ways to be looking some place you didn’t realize. Might have accidentally made an alias, for example