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Are file system level differential/incremental backups possible?

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Is it possible to do a full file system level backup of the data
directory, say once a week, and differentials or incrementals daily?

I'm wondering if there are files that would normally be removed that a
restore: Full then diff/inc would not remove and perhaps
corrupt/confuse things.

Process:
Saturday: Full backup (reset archive bits) of data dir with database shutdown
Sunday: Differential (don't reset archive bits) of data dir with
database shutdown
Monday: Differential (don't reset archive bits) of data dir with
database shutdown
Wednesday: Restore to test server using Saturday's Full and Monday's
Differential.

Obviously this works for regular files/file systems; however, I'm not
sure this is a good method with postgresql as the resulting data dir
*may* (?) contain extra files (or other issues)?

Note: our database is 850GB (Windows 2008 R2 pg version 8.3.12)

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