Requirements: FAIL

Hi! I’m a very very beginner asking about the FAIL in Reserved files.

I have build pages on xampp, moved it today to webserver, made some updates there. And I need to search & replace links there, becouse some of them still show me “localhost”. But before I replace links I want to take duplicate. I have never before faced has this kind of fail as I try to make duplicate package:

Create new ->
`Requirements: Fail
System requirements must pass for the Duplicator to work properly. Click each link for details.
PHP Support Pass
Required Paths Pass
Server Support ass
Reserved Files Fail
WordPress Root Path: /home/xxxxx/public_html/xxx
A reserved file(s) was found in the WordPress root directory. Reserved file names include [dup-installer (directory), installer.php, [HASH]_installer.php, installer-backup.php, [HASH]_installer-backup.php, [HASH]_archive.zip|daf, dup-installer-bootlog__[HASH].txt, dup-wp-config-arc__[HASH].txt]. To archive your data correctly please remove any of these files from your WordPress root directory. Then try creating your package again.

I find these files on Duplicator-Tools-Diagnostics-Data cleanup.
Before I have used Duplicator and every time deleted files only on Pakcages- Delete.

My question, is this the place I need clean every time i have made some migration?
What about build cache then, do i need to clear it too.