[stable-25-3] backport incr backup restore for indexes

[Enjection]

Changelog entry

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Changelog category

• New feature
• Experimental feature
• Improvement
• Performance improvement
• User Interface
• Bugfix
• Backward incompatible change
• Documentation (changelog entry is not required)
• Not for changelog (changelog entry is not required)

Description for reviewers

...

[github-actions]

⚪ 2025-12-04 08:34:38 UTC Pre-commit check linux-x86_64-relwithdebinfo for 748079e has started.
⚪ 2025-12-04 08:34:43 UTC Artifacts will be uploaded here
⚪ 2025-12-04 08:38:48 UTC ya make is running...
🟡 2025-12-04 10:49:21 UTC Some tests failed, follow the links below. Going to retry failed tests...

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
41089	38411	0	8	2651	19

⚪ 2025-12-04 10:52:42 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-12-04 11:10:27 UTC Some tests failed, follow the links below. Going to retry failed tests...

Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
816 (only retried tests)	797	0	3	0	16

⚪ 2025-12-04 11:10:38 UTC ya make is running... (failed tests rerun, try 3)
🔴 2025-12-04 11:27:29 UTC Some tests failed, follow the links below.

Ya make output | Test bloat | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
566 (only retried tests)	542	0	2	1	21

🟢 2025-12-04 11:27:38 UTC Build successful.
🟡 2025-12-04 11:27:56 UTC ydbd size 2.3 GiB changed* by +804.3 KiB, which is >= 100.0 KiB vs stable-25-3: Warning

ydbd size dash	stable-25-3: 31b6296	merge: 748079e	diff	diff %
ydbd size	2 443 329 224 Bytes	2 444 152 800 Bytes	+804.3 KiB	+0.034%
ydbd stripped size	522 925 480 Bytes	523 071 816 Bytes	+142.9 KiB	+0.028%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[github-actions]

⚪ 2025-12-04 08:34:44 UTC Pre-commit check linux-x86_64-release-asan for 748079e has started.
⚪ 2025-12-04 08:34:58 UTC Artifacts will be uploaded here
⚪ 2025-12-04 08:39:11 UTC ya make is running...
🟡 2025-12-04 11:28:58 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
18162	17621	0	219	299	23

🟢 2025-12-04 11:30:22 UTC Build successful.
🟡 2025-12-04 11:35:14 UTC ydbd size 3.8 GiB changed* by +1.2 MiB, which is >= 100.0 KiB vs stable-25-3: Warning

ydbd size dash	stable-25-3: 31b6296	merge: 748079e	diff	diff %
ydbd size	4 066 591 232 Bytes	4 067 883 288 Bytes	+1.2 MiB	+0.032%
ydbd stripped size	1 514 996 352 Bytes	1 515 368 736 Bytes	+363.7 KiB	+0.025%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[github-actions]

🔴 2025-12-04 08:36:48 UTC The validation of the Pull Request description has failed. Please update the description.

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