I dont mind backups except for a few reasons...
They take up your system with riim you could use.
If they update the program, will it work with a previous version.
If its ON your system, and its ALL corrupted, it Aint there NO more.
Even the best Backup, depends ALOT on GREAT vrus protection. And if you backup the virus or trojan, and it has a timer in it, you may be REALLY out of luck.
A RAW backup, is better then a compressed backup. Bigger yes, but even corrupted you can extract it.
Its better to keep a burned copy of your software and RELOAD it then to deal with all the fun of RELOADING the same stuff.. SOMETHING that you loaded may have been the problem, why put it back on the system.
I hate saying this, but, guess how I learned ALL this....