LHOL - Backups - unpredictable runtime

In LHOL we have a section where customers create a backup of a table and restore from it. It takes time, one estimate says 20 minutes, to do an end to end restore. The lab guide doesn't explain this process and how long it will take, and IIRC it might also be missing instructions / providing incorrect screenshots which add confusion to the process. We should go through LHOL's backup/PITR section and re-work the guide and screenshots.

Start with LHOL's backup/PITR section in the lab guide and review the existing restore instructions and screenshots. Reproduce the end-to-end restore to verify the expected duration, then update the guide so the process, timing, instructions, and screenshots are accurate and clear.

Written by the indexing model from the issue text.