Is it possible to import, only changes since last import using imp/impdp

on our production environment, we export three times a day.(10.00AM,1.00PM,6:30PM)
and We only want to import the evening export - we have to kind of make sure that if the online system fails _ we have a data up to yesterday evening.
i.e. we want a sort of incremental import, for example we would have yesterday's evening import and today we only want to import all the changes since yesterday's evenings import - that means we want to import into existing database but we want to import only the changes since last import.
it would be great to hear from you
the database is 10g R1
thank you

Thank you all, for your prompt response
I know about RMAN, but our management outsourced our data center and the guys there does not look comfortable around oracle - and me as a DBA was assigned to taking this export backup and import it to another PC once in a day
so I was thinking if it was possible to import "incrementally"
it is good to know that it is not possible, because I don't have to spend time looking for a solution which is not there.
Thanks all

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--Exact OS version
SunOS dbw01 5.10 Generic_141444-09 sun4v sparc SUNW,SPARC-Enterprise-T2000
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Oracle9i Release 9.2.0.6.0 - 64bit Production
PL/SQL Release 9.2.0.6.0 - Production
CORE 9.2.0.6.0 Production
TNS for Solaris: Version 9.2.0.6.0 - Production
NLSRTL Version 9.2.0.6.0 - Production
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Connected to: Oracle9i Release 9.2.0.6.0 - 64bit Production
JServer Release 9.2.0.6.0 - Production
Export file created by EXPORT:V09.02.00 via direct path
import done in US7ASCII character set and AL16UTF16 NCHAR character set
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. . importing table "CFD_ACTIVE_EMPLOYEE_COUNT" 0 rows imported
. . importing table "CFD_ADDRESS" 1435608 rows imported
. . importing table "CFD_APPEAL" 1688 rows imported
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. . importing table "CFD_APPEAL_NOTES_LNK" 2564 rows imported
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. . importing table "CFD_CODE" 379 rows imported
. . importing table "CFD_CONSTRAINT_CONTEXT" 2823 rows imported
. . importing table "CFD_CONSTRAINT_CRITERIA" 34070 rows imported
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Is it possible to import, only changes since last import using imp/impdp

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