How to correctly completely collapse the 1C base, and what is the risk?

Question

1C

Hello. Happy New Year.
There is a configuration base Accounting 3.0.
There is a task: to completely cut off this base with the removal of all documents that go beyond the period.
The base was rolled up by standard processing: for all accumulation registers and for dependent registers of information that could be rolled up (except for those included in accounting).
All documents up to a certain period were marked for deletion, including VAT and OS documents.
I would like to know how correct this is, and what pitfalls can appear?