Two questions

[AdamAnon]

Greetings!

Two questions.

Do I have to have three time intervals to specify a custom strategy? Can I have just one? I want to run backups every two hours and I want to keep all the backups for the first 30 days and then simply one backup per day until disk space runs out. So that would be simply

--strategy 30:1

Is that right?

Can I manually delete some older or the oldest backups or will it break the functionality of the script?

Thank you!