It's only a big risk when your hard drive crashes or suffers file corruption. A backup is always a good thing to have. I always install a second hard drive for each computer and maintain a regular backup for each one.
You can easily clone your system to a second drive using the Restore option of Disk Utility:
How to Clone Using Restore Option of Disk Utility
1. Open Disk Utility from the Utilities folder.
2. Select the backup or destination volume from the left side list.
3. Click on the Erase tab in the DU main window. Set the format type to Mac OS Extended (journaled, if available) and click on the Erase button. This step can be skipped if the destination has already been freshly erased.
4. Click on the Restore tab in the DU main window.
5. Select the backup or destination volume from the left side list and drag it to the Destination entry field.
6. Select the startup or source volume from the left side list and drag it to the Source entry field.
7. Double-check you got it right, then click on the Restore button.
8. Select the destination drive on the Desktop and press COMMAND-I to open the Get Info window. At the bottom in the Ownership and Permissions section be sure the box labeled "Ignore Permissions on this Volume" is
unchecked. Verify the settings for Ownership and Permissions as follows: Owner=system with read/write; Group=admin with read/write; Other with read-only. If they are not correct then reset them.
For added precaution you can boot into
safe mode before doing the clone.
You can then use a third-party backup utility to maintain the clone with incremental updates. Some good choices are:
Retrospect
Synchronize! Pro X
Synk 6
Deja Vu
All work with Panther and Tiger and can perform both full and incremental backups as well as maintain bootable clones.
I agree, if all your software works fine there's no need to upgrade unless upgrades provide new features that you can use.
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