[Grammar] Please Help me to correct if any wrong.

[aju India]

Dear sir,
Yesterday, I had a work so I was not able to send an email about backup.Tonight, you can take the backup.I will leave my PC ON.

Thanks and regards,
aju.

 

[teechar]

Dear sir,
Yesterday, I had [STRIKE]a[/STRIKE] so much work [STRIKE]so[/STRIKE] that I was not able to send an email about the backup.Tonight, it will be ready for you to take [STRIKE]you can take the backup[/STRIKE]. I will leave my PC on.

Thanks and my regards,

Aju.