In-place Upgrade to 64bit with separate Database?

In-place Upgrade to 64bit with separate Database?

Hi We have 32Bit Servicedesk with separate database running on a separate Microsoft SQL server. We would like to upgrade to 64bit version on the same server. Is the below process correct:
1) backup everything
2) Uninstall 32bit application and remove remaining SD folders
3) Install 64bit application with the same version and build as 32bit
4) Setup the database connection to the original MS SQL

Note: how about archived requests and file attachments, is this also part of the application backup?
Thanks for any help.

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