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svn hotcopy incremental overwrites existing revisions in backup

From: lumi <grigoriy.vasilchenko_at_gmail.com>
Date: Tue, 16 May 2017 06:21:06 -0700 (MST)

I use "svnadmin hotcopy --incremental" command to create backup. Subversion
1.9.5. It was discovered that this command recreates already backuped
revisions files which size exceeds e.g. 120kb in directory db/revs/. Backup
log (1st backup was made to empty folder, next ones to the same folder):
C:\Users\Администратор.WIN-DBM2OE9OJ54>svnadmin hotcopy
D:\Repositories\Sandbox D:\Test --incremental
/* Copied revision 0.
* Copied revision 1.
* Copied revision 2.
* Copied revision 3.
* Copied revision 4.
* Copied revision 5.
* Copied revision 6.
* Copied revision 7.
* Copied revision 8.
* Copied revision 9.
* Copied revision 10.
* Copied revision 11.
* Copied revision 12.
* Copied revision 13.
* Copied revision 14.
* Copied revision 15.
* Copied revision 16.
* Copied revision 17.
* Copied revision 18.
* Copied revision 19.
* Copied revision 20.
* Copied revision 21.
* Copied revision 22.
* Copied revision 23.
* Copied revision 24.
* Copied revision 25.
* Copied revision 26.
* Copied revision 27.
* Copied revision 28.
* Copied revision 29.
* Copied revision 30.
* Copied revision 31.
* Copied revision 32.
* Copied revision 33.
* Copied revision 34.
* Copied revision 35.
* Copied revision 36.
* Copied revision 37.
* Copied revision 38.
* Copied revision 39.
* Copied revision 40.
* Copied revision 41.
* Copied revision 42.
* Copied revision 43.
* Copied revision 44.
* Copied revision 45.
* Copied revision 46.
* Copied revision 47.
* Copied revision 48.
* Copied revision 49.
* Copied revision 50.
* Copied revision 51.
* Copied revision 52.
* Copied revision 53.
* Copied revision 54.
* Copied revision 55.

C:\Users\Администратор.WIN-DBM2OE9OJ54>svnadmin hotcopy
D:\Repositories\Sandbox D:\Test --incremental
* Copied revision 14.
* Copied revision 21.
* Copied revision 22.

C:\Users\Администратор.WIN-DBM2OE9OJ54>svnadmin hotcopy
D:\Repositories\Sandbox D:\Test --incremental
* Copied revision 14.
* Copied revision 21.
* Copied revision 22./

And so on with each next hotcopy --incremental command. Binary comparison
revision 14, 21, 22 files of original repositary and backup gives equal
result. What reason of this strange behaviour?

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