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<p>The Case Information Database (CID) has been the source immigration case working
system since 1998. Individual records of immigration status have therefore been digitised
for the last 20 years. CID undergoes nightly back-ups to tape and has replication
between the primary and secondary data centres.</p><p>There has been no systematic
loss of immigration status records. Where any individual cases are identified or raised
as having incorrect or incomplete records, these are treated as an absolute priority.</p>
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