In E3, copied across and down:
Formula:
=IFERROR(INDEX('Backup Data'!B:B,AGGREGATE(15,6,ROW('Backup Data'!$B$5:$B$100)/(('Backup Data'!$C$5:$C$100>='Find Project '!$C$3)*('Backup Data'!$C$5:$C$100<='Find Project '!$C$4)*('Backup Data'!$E$5:$E$100='Find Project '!$C$5)*('Backup Data'!$F$5:$F$100='Find Project '!$C$6)*('Backup Data'!$G$5:$G$100='Find Project '!$C$7)*('Backup Data'!$H$5:$H$100='Find Project '!$C8)*('Backup Data'!$I$5:$I$100='Find Project '!$C$9)*('Backup Data'!$J$5:$J$100='Find Project '!$C$10)),ROWS(E$3:E3))),"")
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