If you would now tar an folder inside your home directory, then your uid will be saved. Let's make an example:
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drwxr-xr-x tc root 1024 testfolder
On your system, user tc has the uid 1001. Now you tar the folder, and extract it on another computer. Let's assume you have an user called dummy with the uid 1001 on that other computer. After untaring the folder, it will look like this:
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drwxr-xr-x dummy root 1024 testfolder
On a system without an user having the uid 1001 it would look like this:
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drwxr-xr-x 1001 root 1024 testfolder
You understand what i mean?
glitzi