Backing up repository differentially

If today I back up my repository's root folder and it has 10 revisions, and
tomorrow I back up my repository with 15 revisions, can I back up on the
second day differentially? (i.e. back up only the 5 new revisions as opposed
to all 15?)

How would I do this? (Is it a filesystem issue whereby there are certain
files that need to be copied over, or are there specific Subversion commands
for this?)

Thanks.

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