when you take backup then we need to save that file into other location and then once installation over then we can restore it.
if you save same tableau server location then it will clear once install new one.
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The previous version of the backup you can store at another location but after you install the Tableau Server 2018.2.0 and above the backup file will require to be in the specific location in order to restore the file.
The Tableau Server 2018.2.0 and above, back up will need to be copy and move to this location "x:\Program Files\Tableau\Tableau Server\data\tabsvc\files\backups"
Replace the "X" with your drive letter.
Once the file is in place, stop the tableau server services then execute the restore command.
eg: tsm maintenance restore --file tableau.tsbak