Research on the built in data backup capabilities of office 365?

1. No PIT restore! OFFICE 365 doesn’t work this way!
See here how exchange works regarding backup and restore incl retention:

https://docs.microsoft.com/en-us/office365/servicedescriptions/exchange-online-service-description/high-availability-and-business-continuity

https://docs.microsoft.com/en-us/exchange/back-up-email

Regarding sharepoint and OD it works in a similar way with a 2 stage recycle bin and 93 days combined! 30 days for lists and libraries, collection sites etc
MS also backs up the infrastructure 14 days back afaik! You have to contact them to do a restore here

https://docs.microsoft.com/en-us/office365/securitycompliance/office-365-sharepoint-online-data-deletion

Also, to keep data etc you also use retention here!!
https://docs.microsoft.com/en-us/office365/securitycompliance/retention-policies

SharePoint use versioning (shadow copies)

https://support.office.com/en-ie/article/how-does-versioning-work-in-a-sharepoint-list-or-library-0f6cd105-974f-44a4-aadb-43ac5bdfd247

Also there is onedrive restore for disaster recovery, also rolling out for sharepoint!

https://support.office.com/en-ie/article/restore-your-onedrive-fa231298-759d-41cf-bcd0-25ac53eb8a15