Hello Sergio Londono,
Welcome to the MS Q&A platform.
Microsoft 365 Business Premium includes retention policies for Exchange Online mailboxes, OneDrive for Business, and Microsoft Teams chat.
A similar thread has been discussed here
for your other question, if a user deletes content that is subject to a retention policy, the content will still be retained according to the retention policy.
I hope this helps. Please let me know if you have any further questions.