Backup your backup strategy ? Its sound cool...huh. But actually, this is hard thing to do. As SAP Basis which usually also work as DBA, you cannot decide this by yourself. You'll need to manage this through deal with other people from different department and also from your company management. May be you'll think like this.
Why do I have to get permission from other department ? Why not just from IT Manager and Company Management ?
This is complex job and all people on your company rely on your IT system. When this system is down, all of them will get the effect. All you need is to define precise backup strategy. Few things need to consider before deciding backup strategy such as :
1. How many hours that your company will compromise about downtime ? 1 hour ? 5 hours ? a days ? Check this !
2. How many hours do you need to restore your data ? Check your tape backup speed to restore. Do this regularly for example once in 3 months.
3. How many budget do you have to perform this backup strategy ? Backup tape and backup drive also has its limitation on read and write activities.
This just few things need to consider. You can found differently on your company. Depend on your company policy.