Will a system restore from Time Machine erase any of the data that is currently on the Mac and not in the Time Machine?

We had a lot of data on our Mac (i.e. photos, iTunes libraries etc) which we backed up via Time Machine. The hard disk corrupted so we had to get it wiped. When we got it back, my parents started using the mac as per usual but they didn't do a full System Restore from Time Machine. So, if I do a full restore now, will it erase any of the new photos, musc etc that is currently on the mac?

The Time Machine restore will only restore what is on Time Machine.  Making a clone is probably a better means of ensuring whatever data you want recovered gets recovered together with Time Machine.
Generally speaking, applications that are newer than the operating system from Apple that are included with the operating system are not supported.  So in your data recovery process from your clone, you'll have to be careful what data you choose to copy back.

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