DBTK Double-Take Software (MM)

CUSIP No. 258598101
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1. NAME OF REPORTING PERSON
 I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

 Cortina Asset Management, LLC
 56-2450074

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2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

 (a) [ ]
 (b) [ ]

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3. SEC USE ONLY

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4. CITIZENSHIP OR PLACE OF ORGANIZATION

 Wisconsin

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 5. SOLE VOTING POWER:

NUMBER OF ------------------------------------------------------
SHARES 6. SHARED VOTING POWER: None
BENEFICIALLY
OWNED BY ------------------------------------------------------
EACH 7. SOLE DISPOSITIVE POWER:
REPORTING
PERSON WITH ------------------------------------------------------
 8. SHARED DISPOSITIVE POWER: None

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9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON



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10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
 SHARES [ ]

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11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)



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12. TYPE OF REPORTING PERSON

 IA

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Item 1(a) NAME OF ISSUER
 Double-Take Software Inc.

 (b) ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES
 257 Turnpike Road, SUite 210 Southborough, MA 01772


Item 2(a) NAME OF PERSONS FILING
 Cortina Asset Management, LLC

 (b) ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE
 825 North Jefferson Street, Suite 400, Milwaukee, Wisconsin 53202

 (c) CITIZENSHIP
 Cortina is a Wisconsin limited liability company

 (d) TITLE OF CLASS OF SECURITIES
 Common Stock

 (e) CUSIP NUMBER
 258598101


Item 3. Type of Person:

(e) [X] Cortina is an Investment Adviser registered under section 203
 of the Investment Advisors Act of 1940



Item 4. OWNERSHIP

Ownership (as April 30, 2010):

 (a) Amount owned "beneficially" within the meaning of rule 13d-3:


 (b) Percent of class:


 (c) Number of shares as to which such person has:

 (i) Sole power to vote or to direct the vote



 (ii) Shared power to vote or direct the vote

 None

 (iii) Sole power to dispose or to direct the
 disposition of



 (iv) Shared power to dispose or to direct the
 disposition of

 None


Item 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS

 Not Applicable

Item 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON

 Not Applicable


Item 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH
 ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING
 COMPANY OR CONTROL PERSON

 Not Applicable


Item 8. IDENTIFICATION AND CLASSIFICAITON OF MEMBERS OF THE GROUP

 Not Applicable


Item 9. NOTICE OF DISSOLUTION OF GROUP

 Not Applicable


Item 10. CERTIFICATION

By signing below I certify that, to the best of my knowledge and belief, the
securities referred to above were acquired and are held in the ordinary course
of business and were not acquired and are not held for the purpose or with the
effect of changing or influencing the control of the issuer of the securities
and were not acquired and are not held in connection with or as a participant
in any transaction having that purpose or effect.



SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.


 May 3, 2010
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 Date



 /s/LORI K. HOCH
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 Signature

 Lori K. Hoch
 Chief Operating Officer and
 Chief Compliance Officer
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 Name/Title