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Add recommendations on when to run maintenance (#4398)

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#### Does this PR need a docs update or release note?

- [ ] ✅ Yes, it's included
- [ ] 🕐 Yes, but in a later PR
- [x] ⛔ No

#### Type of change

- [ ] 🌻 Feature
- [ ] 🐛 Bugfix
- [x] 🗺️ Documentation
- [ ] 🤖 Supportability/Tests
- [ ] 💻 CI/Deployment
- [ ] 🧹 Tech Debt/Cleanup

#### Test Plan

- [x] 💪 Manual
- [ ] ⚡ Unit test
- [ ] 💚 E2E
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ashmrtn 2023-09-28 11:19:14 -07:00 committed by GitHub
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website/docs/setup/maintenance.md
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@ -43,3 +43,15 @@ may not result in a reduction of objects in the storage service Corso is backing
Deletion of old objects in the storage service depends on both wall-clock time and running maintenance.
Later maintenance runs on the repository will remove the data.
## Maintenance guidelines
For the best experience, the recommendation is to run metadata maintenance every
20–30 backups. Complete maintenance should be run every 1–2 weeks
depending on how many backups are deleted from the repo. More backup deletions
means that complete maintenance should be run more often so that unneeded blobs
in storage get deleted.
Not running maintenance exactly according to the recommendations won't impact
the correctness of the data in the repo, but could result in decreased
performance.