Set Differeatial backup monthly.

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SQL-Server

SQL-Server-2008

Dear Professionals,
Please suggest.
I have stucked in a scenario .

Its is about MS SQL database backup.

I need to upload my database backup on cloud.Currently I am backing up my database regularly(Full,Diff,Tlog.).

My problem is I have to upload my database backup on cloud where I have to upload my full backup first time and then after 1 month I have to upload differential backup monthly.
eg. Full(1 Aug)+Diff( from 1 aug to 1 sep) + Diff(from 1 sep to 1 oct)...

And it should not affect my regular backup schedule.

because I can't upload full backup every month.
If I am correct MSSQL does back up like .

Full => Diffrential =>(Will create LSN ) Diffrential => (Will create LSN )Diffrential => .........(Without using TLog)

So if i continue this schedule I can create differential backup for 1 month .(because will use the lase LSN )
Like from aug to sep ,sep to oct....


So please suggest how can I?


Thank you all in advance.